Stay connected with us on social media
Wall Crack Repair: Everything You Need to Know
Wall cracks are a definite sign of an emerging issue that you shouldn’t ignore. From hairline fractures to deeper splits, these imperfections creep into your walls quietly, then get worse when monsoons roll in.
Whether it’s fixing cracks in plaster walls or filling cracks in exterior walls, this guide will walk you through the right way to do wall crack repair at home. Simple tools, smart steps, and a lot less guesswork because your walls deserve better than patchy fixes. Let’s get into it.
Why Wall Crack Repair is Important
Ignoring wall cracks won’t make them go away; in fact, it gives them time to cause more damage than you might expect. Timely wall crack repair helps protect both aesthetics and structure. Treating cracks early saves time and money, and spares you from costlier repairs later. Here’s why it’s so important
- Cracks act like open doors for moisture, allowing it to seep in and lead to damp walls and eventual fungal growth.
- Seepage from cracks can weaken plaster and even affect nearby electrical fittings.
- Paint starts to bubble or peel, leaving your walls looking uneven and poorly maintained.
- In older buildings, unchecked cracks can be early signs of deeper structural shifts.
- Cracks near windows or beams can signal alignment issues that should never be left unaddressed.
For moisture-related issues, this guide to fixing dampness in walls is worth bookmarking.
Identifying Different Types of Wall Cracks
Before filling cracks in walls, it’s essential to understand what kind of crack you’re dealing with. Not every crack means the same thing, and treating them all the same way can lead to adverse results.
Hairline Cracks vs. Deep Structural Cracks
Hairline cracks may seem harmless, but they can hint at underlying issues. Deep cracks, on the other hand, are rarely cosmetic and should be taken seriously.
| Type | Appearance | Cause | Risk Level | Treatment |
| Hairline cracks | Thin, less than 1 mm | Plaster shrinkage or surface stress | Low | DIY patching |
| Deep structural cracks | Wider than 3 mm, sometimes uneven | Foundation shift, load-bearing stress | High | Needs expert assessment |
Surface Cracks on Plaster vs. Cracks in Brick or Concrete
Where the crack appears can also guide how you fix it. Plaster cracks are often cosmetic, while brick or concrete wall cracks demand closer inspection
| Type | Area Affected | Usual Cause | What It Might Indicate | Repair Scope |
| Cracks on plaster | Interior wall finish | Humidity, temperature change | Mostly surface-level | DIY possible |
| Cracks in brick/concrete | Structural wall | Settling, seismic activity | Potential structural weakening | Likely needs professional work |
.
When to DIY and When to Call a Professional
If the cracks are small, surface-level, and stable over time, you can manage with a reliable crack filler like Birla Opus’ Alldry Crack Master Paste. But if they keep growing, spread across multiple walls, or show up diagonally near beams or corners, stop patching and get a structural expert involved. Better to spend on expert advice than risk long-term damage.
Tools and Materials You’ll Need
Before fixing cracks in plaster walls or concrete, having the right tools makes the process smoother and the finish cleaner. A few well-chosen items can help you avoid repeated fixes and give longer-lasting results
- Crack filler or putty: Choose a quality filler that can handle both hairline and wider cracks. Look for one that doesn’t shrink too much after drying, especially important for concrete wall crack repair or filling cracks in exterior walls exposed to weather shifts.
- Putty knife or trowel: Use this for even application. A flexible blade works better on hairline cracks, while a stiffer one is useful for deeper cracks or uneven surfaces.
- Sandpaper: After the filler dries, sand the patch for a flush finish. Skipping this step makes the repair obvious after painting, especially on light-coloured walls.
- Wire brush: For fixing cracks in brick walls, a wire brush helps remove loose mortar or debris. It also preps the surface so the filler bonds better.
- Primer and topcoat (optional): These help seal the repaired area and restore uniformity. Especially useful if you’re dealing with high-humidity zones or want the repair to disappear under a fresh coat of paint..
Step-by-Step Guide to Filling Cracks in Interior Walls
When filling cracks in walls, especially interiors, rushing the process usually leads to visible patches and peeling later. Here’s how to do it right, step by step.
- Clean the crack: Start by using a dry brush or wire brush to remove dust, loose plaster, and any flaky paint. If the crack isn't clean, the filler won’t hold properly and might come off in a few weeks.
- Widen slightly (if hairline): If the crack is too fine, use a scraper or screwdriver to widen it just a bit. This gives the filler something to grip onto. It’s especially important for stubborn hairline cracks that keep reappearing.
- Apply crack filler: Using a putty knife, press the filler firmly into the crack. Spread it evenly across the surface, not just inside the gap. This avoids ridges and gives you a neater finish. If you're fixing cracks in plaster walls, a smooth filler makes painting easier later.
- Dry and sand: Allow the filler to dry completely, and don’t rush it with a fan or dryer. Once dry, sand the area using fine-grit sandpaper. This helps blend the patch with the surrounding wall.
Prime and paint: Apply a primer to seal the patch. Then paint over it with your wall colour for a clean, seamless look. This step is crucial if you want the repair to stay invisible. For best results, here’s how to use a paint roller on walls like a pro.
Filling Cracks in Exterior Walls
Filling cracks in exterior walls needs a different approach than interior repairs. These walls deal with heat, rain, dust, and constant expansion and contraction, so a quick patch job won’t hold up for long
- Use weatherproof or cement-based crack fillers: Go for fillers made specifically for outdoor use. Cement-based or elastomeric fillers are better suited to handle temperature swings and won’t wash away during the first rain.
- Apply a waterproof coating post-filling: Once the crack is sealed and dry, apply a waterproof layer over the area. This acts as an extra shield, especially important if you’ve had issues with seepage or dampness in the past.
- How to seal before the monsoon or repainting: If you’re planning to paint or the rains are approaching, seal cracks early. Waiting too long can let water in through even the smallest gaps, leading to peeling paint, swollen walls, or even fungal stains.
For houses in coastal or high-humidity zones, these steps are non-negotiable. You can explore our exterior waterproofing solutions guide to protect your walls year-round and make the crack repairs last longer.
Fixing Cracks in Plaster and Brick Walls
Fixing cracks in plaster walls is mostly about surface repair, while fixing cracks in brick walls often requires structural attention. Knowing the difference helps you pick the right product and avoid wasting time redoing the job
- Plastered wall cracks: For plaster, use a high-quality interior putty or a polymer-based crack filler. These work well for hairline cracks and minor shrinkage. Make sure the surface is clean and dry before applying. Once filled, sand and repaint for a smooth blend.
- Products like Birla Wall Putty or Birla Crack Filler are ideal for these kinds of jobs.
- Brick wall cracks: These require a bit more prep. Start by chiselling or cutting slightly deeper into the crack to remove loose material. Clean out all dust and fill the space with a masonry-grade sealant. The goal is to ensure strength, not just patch the surface. Allow adequate curing time before painting or waterproofing.
- Don’t leave gaps before sealing: Whether it’s plaster or brick, leaving air pockets or gaps will eventually cause the filler to crack again. Always press the material deep into the crack and compact it well before you finish.
Concrete Wall Crack Repair Techniques
Concrete wall crack repair involves considering both looks and strength. Since concrete supports load and structure, any crack could signal stress that needs more than just surface treatment.
- Use epoxy or polymer-modified mortar: For fine to moderate cracks, epoxy fillers or polymer-modified mortars work well. They bond tightly with concrete, resist shrinkage, and stay intact even with slight wall movement. These are especially effective in high-stress zones like columns or boundary walls.
- Crack injection methods for deeper cracks: For deeper, active cracks, injection techniques are often used. Epoxy or polyurethane is injected directly into the crack under pressure, filling it from the inside out. This method is common in basements or retaining walls where water ingress is a concern.
- When to consider structural repair evaluation: If the cracks are wide, spreading, or reappearing despite repairs, it's time for a structural check. Cracks near beam-column joints or across large spans can indicate foundational shifts or load stress. In such cases, patching won’t help and might hide serious issues.
Say Goodbye to Cracks in Walls
Wall cracks may seem minor, but if left untreated, they can lead to more significant issues, such as damp patches, peeling paint, or even structural trouble. Whether it’s filling cracks in walls, tackling concrete wall crack repair, or fixing cracks in brick walls, using the right tools and techniques makes all the difference.
For long-lasting results and expert-grade products, explore our crack fillers and waterproofing solutions, specifically designed for Indian homes and weather conditions.
Find the right product for your wall at Birla Opus.
Frequently Asked Questions
Painting your home is fun and hassle-free when planned well. For that, you must know all about various aspects of the painting process. Find answers to all your paint questions here!
Sign up for our colour letter
Get vibrant ideas, expert decor tips, and colour trends to keep you updated
Popular searches
Back to Select colour
Step
Selected colour
2 Select quantity for "The clouds have shape"
Item added to cart
Terms and Conditions
This Website/ App is owned by Grasim Industries Limited, Birla Paints division (“Grasim”).
“we” / “us” / “our” means Grasim Industries Limited (Grasim)
“You” or “your” means any person who visits our Website/ App.
Please read these Terms and Conditions of use carefully before using this Website/App. The Terms and Conditions set forth below (the "Terms") as well as those contained in the Privacy Policy of the Website/App governs your use of the Website/App and are legally binding on you. If you do not agree to all of these Terms or Privacy Policy, do not use access or otherwise this Website/App or any information contained on the Website/ App.
Your use of the Website/App shall be deemed to be your understanding of, and agreement, to each of the Terms set forth herein. Grasim may revise and update these Terms from time to time. Your continued usage of the Website/App shall be considered as an implied acceptance/deemed consent to abide by these Terms for usage of this Website/App.
Privacy Policies
1. PURPOSE
Thank you for visiting our Website/ App. This Website/ App is owned by Grasim Industries Limited, Birla Paints division (“Grasim”). This Privacy Policy is designed to tell you about our practices regarding collection, use, and disclosure of information that you may provide via this Website/ App. Grasim is committed to protecting the privacy of every individual who installs and/or uses the Website/App. We have adopted the following Privacy Policy, which sets out the basis on which any personal data we collect from you, or that you provide to us, will be handled and dealt by us through your use of the Website/App. Please be sure to read this entire Privacy Policy before using, or submitting any information, to this Website/App, which is intended for use by residents of India.
2. SCOPE OF APPLICATION
- This policy will be applicable to all personally identifiable information that you provide to Grasim while visiting or using the Website/App. This Website/App contains links to other Apps. Please be aware that we are not responsible for the content or privacy practices of such other Apps. We encourage our users to be aware when they leave our Website/App and to read the privacy statements of any other App that collects personally identifiable information.
- Grasim expressly reserves the right to change this Privacy Policy periodically in future which will be exercised at its sole discretion, and at such intervals of it choosing the right without prior notice to the users. User shall review our Privacy Policy available at the Website/App regularly to be sure you are fully updated with our current practices and procedures in this area. Your continued use of the Website/App will be subject to the then-current Privacy Policy.
- The following discloses our information gathering and dissemination practices for the Website/App:
- Overview: As part of the normal operation of the Website/App, we collect and, in some cases, may disclose personally identifiable information about you. This Privacy Policy describes the personally identifiable information we collect about you and what may happen to that information.
- By accepting this Privacy Policy and our Terms of Use, you expressly consent to collect, store, delete, use, combine and disclose your personally identifiable information in the manner prescribed in this Privacy Policy. This Privacy Policy is incorporated into and is subject to the conditions of the Terms of Use and governs all use of the Website/App by You.
- We may collect your name, address, email address, telephone number, and other personally identifiable information you submit on the Website/App. Such personally identifiable information will not be posted in areas of the Website/App viewable by the public or users of the Website/App.
- By using this Website/App, you agree with the terms of this Privacy Policy. Whenever you submit information via this Website/App or through any other mode, you consent to the collection, use, and disclosure of that information in accordance with this Privacy Policy.
3. DATA GATHERING
Collection of Information: We may collect information that you share with us through your use of our Website/App, for example by:
- E-mailing or writing to us using the contact details posted on our Website/App; or
- Submitting other enquiries.
4. OUR USE OF YOUR INFORMATION
Our primary goal in collecting personally identifiable information is to provide you with a smooth, efficient and customized experience. This allows us to provide services and features that are most likely to meet your needs, and to customize the Website/App and our services to make your experience easier. We may use the information we collect from you to provide you with information and services that you request from us. We use personally identifiable information in the files we maintain about you, and the other personally identifiable information we obtain from your current and past activities on the Website/App to provide you with services.
4.1. Our Disclosure of Your Information
- Due to the existing regulatory environment, we cannot ensure that all of your private communications and other personally identifiable information will never be disclosed in ways not otherwise described in this Privacy Policy. By way of example (without limiting the foregoing), we may be required to disclose personally identifiable information to the government, law enforcement agencies, or third parties under certain circumstances; third parties may unlawfully intercept or access transmissions or private communications; or users or authorized users may independently abuse or misuse your information that they collect from the Website/App in violation of our Website/App’s Privacy Policy and Terms of Use. Therefore, although we use industry standard information security practices to protect your privacy, we do not promise, and you should not expect, that your personally identifiable information or private communications will always remain private.
- As a matter of policy, we do not sell or rent any personally identifiable information about you to any third party. However, the following describes some of the ways that your personally identifiable information may be disclosed.
- Other Corporate Entities: We may sometimes share data with our affiliates, associates, subsidiaries, joint ventures, group entities, and third-party service providers that provide us with services and/or provide you with services. To the extent that these entities have access to your personally identifiable information, we will ask them to treat it at least as protectively as they treat personally identifiable information they obtain from their other authorized users or members. Our affiliates, subsidiaries, and joint ventures will follow privacy practices no less protective of all authorized users and members than our practices described in this document, to the extent allowed by applicable law. It is possible that Grasim, its subsidiaries, associates, affiliates, joint ventures or any combination of such, could merge with or be acquired by another business entity. Should such a combination occur, you should expect that Grasim would share some or all of your personally identifiable information in order to continue to maintain and provide access to the Website/App.
- Legal Requests: Grasim co-operates with law enforcement inquiries, as well as other third parties to enforce laws relating to matters, such as intellectual property rights, fraud and other rights. We can (and you authorise us to) disclose any personally identifiable information about you to law enforcement and other government officials as we, in our sole discretion, believe reasonably necessary or appropriate, in connection with any investigation.
4.2. Changing Your Personally Identifiable Information
In case you request to remove your personally identifiable information from our records, we will retain such information in our files and databases, in order to use it in some unavoidable circumstances, such as to resolve disputes, troubleshoot problems, and enforce our terms and conditions. Further, such prior personally identifiable information is never completely removed from our databases due to technical and legal constraints, including stored "back up" systems. Therefore, you should not expect that all of your personally identifiable information will be completely removed from our databases in response to your requests.
6. SECURITY
Grasim will use reasonable security measures to safeguard the confidentiality of your personal identifiable information. Although we will put our best efforts to protect your personal data, we cannot guarantee the security of your data transmitted to our Website/ App; any transmission is at your own risk. Once we have received your information, we will use strict procedures and security features which are appropriate to the type of personal information you have provided to try to prevent unauthorised access or inadvertent disclosure. However, you agree and acknowledge that "perfect security" does not exist on the Internet.
7. CHANGES TO OUR PRIVACY POLICY
We reserve the right to change, suspend, or discontinue any aspect of the Website/ App at any time. Any modifications we may make to our privacy policy in the future will be posted on this page. Continued use of the Website/App will signify that you agree to any such modifications.
8. LEGAL DISCLAIMER
This is the official Website/ App of Grasim Industries Limited and provides general information about Grasim Industries Limited. The information and content are based on the laws applicable in India. While efforts are made to keep the information on this Website/App accurate and timely, Grasim does not guarantee or endorse the content, accuracy or completeness of the information, text, graphics, hyperlinks and other items contained herein or on any other server. This Website/ App and the materials, information, and references to services and products if any herein, including without limitations, text, graphics and links, are provided "as is" without representations or warranties of any kind, whether express or implied. To the fullest extent permissible, Grasim disclaims any warranties, express and/or implied, including but not limited to implied warranties of merchantability, fitness for a particular purpose, non-infringement, freedom from computer virus and warranties arising from course of dealing or course of performance. Grasim does not represent or warrant that the functions contained in the Website/ App will be uninterrupted or error free, that defects will be corrected or that the Website/App or the server that makes the Website/App available are free of viruses or other harmful components. Grasim does not make any warranties or representations regarding the use of the materials in the Website/App in terms of their completeness, correctness, accuracy, adequacy, usefulness, timeliness, reliability or otherwise. Users, shall always keep indemnified, defend and hold Grasim, its affiliates, and their respective officers, directors, employees and agents harmless, from and against any claims, demands, causes of action, debts or liability, costs and expenses, including, without limitation, attorney's fees, based upon or relating to a third party claim against Grasim arising from any action or inaction of User or for any liability or expense-due to claims for personal injury or damage to property arising out of the fault or negligence of the User. Grasim is not responsible for any special, indirect, incidental or consequential damages that may arise from the use of or the inability to use, the Website/App and/or the materials contained on the Website/App irrespective of whether the materials contained on the Website/App are provided by Grasim. The contents of this Website/App are subject to change without notice. Commercial use of any of the contents of this Website/App in any manner is prohibited without prior written permission from an authorised person. No reproduction of any part of the Website/App may be sold or distributed for commercial gain nor shall it be modified or incorporated in any other work, publication or Website/App, whether in hardcopy or electronic format, including postings to any other App. Grasim reserves all other rights. No information on this Website/App shall constitute an invitation to invest in the listed companies belonging to the “Aditya Birla Group” conglomerate. Neither Grasim nor the entities belonging to the “Aditya Birla Group” conglomerate, nor their respective officers, employees or agents shall be liable for any loss, damage or expense arising out of any access to or use of this Website/App or any App linked to it, including, without limitation, any loss or profit, loss of business, loss of use, indirect, incidental or consequential loss. By viewing this Website/App you are deemed to agree to jurisdiction of the courts at Mumbai, India in respect of any action arising therefrom or related thereto.
If you have any questions about this Policy or other privacy concerns, you can also email us at legal.birlapaints@adityabirla.com
August 2023
9. Customer Consent
By agreeing to this privacy policy, you agree to receive promotional messages, offers, and updates from the Company via SMS, RCS (Rich communications message service), WhatsApp, etc.
GRASIM INDUSTRIES LIMITED, Birla Paints division
9th floor, Birla Centurion, Century Mills Compound, Pandurang Budhkar Marg, Worli, Mumbai– 400030, Maharashtra, India.
Registered Office:
Birlagram, Nagda- 456 331 (M.P.) Tel: (07366) 246760-66, Fax: (07366) 244114, 246024, CIN: L17124MP1947PLC000410
Allwood Contractor App Helpdesk
Call: 1800 120 1234, Monday to Saturday, 09:30 am – 6:30 pm (Except Public Holidays).
Product Warranty
Terms and Conditions for product warranty registration of Birla Opus products
The Warranty shall be effective from the date of purchase of the Product as per the tax invoice (“Warranty Start Date”), provided that painting work is fully complete, and the Consumer registers the Product for warranty.
The Product must be registered within 15 days from the date of purchase by calling customer care at 18001201234 or registering on www.birlaopus.com and furnishing purchase details as required during the Warranty registration.
The Warranty shall be valid for parameters and period as defined in the respective product warranty document (‘Warranty Period’) from the Warranty Start Date.
Upon settlement of any claim, Warranty of replaced Product will not start afresh, and will continue for the remainder of the Warranty Period from the Warranty Start Date.
If there is a break/ lag in completing the painting work, the registration of the Warranty and Warranty Start Date will be determined by the Company at its sole discretion.
The Company may appoint a person to examine and confirm the application of the Product as per the directions specified prior to registering the Warranty.
For registering of Warranty, where quantity of Product purchase is equal to or more than 200 litres, please call our Helpline on 1800 120 1234 with requisite details. The registration of Warranty in such cases is subject to a satisfactory pre‐inspection at site by Company’s representative.
- For the warranty to be applicable:
- Minimum volume of the product required to be purchased needs to be met
- Birla Opus recommended system needs to be used
- Product coverage and application guidelines need to be adhered
For more details, please refer to respective product specific warranty document and product information sheet.
Consumer may raise a claim within 30 days of discovering issue(s) noticed on the affected areas based on Warranty Parameters/ scope
The Consumer is required to notify the Company of the issue(s) noticed along with the invoice details, sample pictures and basis for Warranty invocation by contacting the customer care at 1800 120 1234. The Consumer shall provide such additional details as required by the Company and/or allow the Company to visit/inspect the painting site either in portion or entirety at the Company’s discretion.
In case where the Company decides that the Warranty is applicable on the issue(s) noticed on the affected areas, the Company shall bear the Replacements Costs as detailed in respective product warranty document to repair/ repaint the affected areas.
Replacement Costs shall mean the cost of material and labour required to correct the affected portions, as determined by the Company.
In case where the Company decides that Warranty is not applicable, the same shall be communicated to the Consumer.
Warranty is applicable only to the affected area where the Product is used in accordance with application guidelines and not to the rest of the areas.
In case the Consumer carries out repair works on the areas covered under the Warranty, the same shall be at their own risk and the Company’s Warranty on the Product shall not be valid on such repaired areas.
The Warranty will cover only manufacturing defects of the Product and will not cover any defects arising out of factors not in control of the Company. For more details of exclusions, please refer to the warranty document of respective product.
Except expressly stated, the Company disclaims any liabilities whether in contract, tort or otherwise. The Company makes no warranty regarding merchantability or fitness of products for any particular purpose.
The Company shall not be held liable towards loss or damages of incidental, indirect or consequential nature or for any value more than the tax invoice value.
In case of any disputes, exclusive jurisdiction of the courts of Mumbai shall apply. Governing laws shall be Laws of India.
The facts and all matters concerning any Warranty/ claim/ dispute will always be kept confidential by both the Consumer and the Company.