# Can I add a DIY insulation kit to my garage door? What the added weight does to springs and the opener > An insulation kit adds weight your door's springs were not sized for. Check with your door's maker first, then have the balance checked. What DASMA and Chamberlain say. Source: https://garagedoorscience.com/blog/diy-garage-door-insulation-kit-springs-opener-weight · by rick · published 2026-10-07 · updated 2026-10-07 Yes, you can buy a kit, but it adds weight to your door, and your door's springs were sized for the door's original weight. The safe way is to check with your door's maker before you add anything, then have the door's balance checked after. Springs and cables are a job for a trained technician, never for you. You want a warmer garage this fall, and a kit you put on yourself looks like the easy way there. That is a fair thing to want. Here is what the extra weight does, and how to add it without turning a cold garage into a broken spring. ## What the added weight does DASMA, the Door & Access Systems Manufacturers Association, covers this in its [Technical Data Sheet 176, "Adding Weight to a Garage Door Assembly"](https://www.dasma.com/wp-content/uploads/pubs/TechDataSheets/CommercialResidential/TDS176.pdf). It says "door springs are designed to accommodate the original intended weight of the door." It goes on: "If additional weight is added to the door sections after the original door installation, the door could become unbalanced such that operation is not smooth, possibly even resulting in damaged or broken springs." The same DASMA sheet says the opener is affected too: "the function of any opener on the door could be adversely affected such that a motor could become overworked or cease functioning." The sheet is about added weight in general. It does not name insulation kits, but a kit is weight added to the door sections after installation, which is what the sheet describes. ## Check your door maker's written policy first DASMA's TDS 176 says plainly that "it is always best to contact the garage door manufacturer." It also says "Garage door manufacturers typically include certain exclusions and limitations in their warranties, particularly regarding alterations to a door." Here is one example of what that wording looks like. The [Clopay Limited Warranty for its Architectural Series](https://cdn.clopay.com/public/documents/WAR-MCW19001E_EN%20(002).pdf) has an exclusion titled "Alteration, Modification or Use of Non-OEM/ Clopay-Approved Parts or Products." It says: "If you make any repair or alteration without first providing notice to and receiving authorization from us, or use any parts, accessories, or attachments other than authorized by Clopay for use in its products, you will be solely responsible for any such repairs or parts and you may void this Warranty." That warranty covers Clopay's aluminum full-view doors, and it does not mention insulation by name. Your door's warranty may read differently, so read your own. We found no opener or door maker page that addresses retrofit insulation kits, either to approve them or to rule them out. [DASMA's technical data sheet index](https://www.dasma.com/technical-data-sheets/) lists a sheet on U-factor and R-value for garage doors (TDS 163) and one on garage doors and condensation (TDS 195), and no sheet on retrofitting insulation. That leaves your door's maker as the one to ask. Ask in writing, and keep the reply. ## How to tell the door is still balanced We cover the full balance test, step by step, in [our garage door balance guide](/blog/how-to-check-garage-door-balance), so we will not repeat the steps here. What it is checking for comes from [Chamberlain's support article](https://support.chamberlaingroup.com/s/article/How-to-test-the-balance-of-a-garage-door-1484145605074): a balanced door "should stay in place, supported entirely by its springs." Chamberlain also says, in its own words, "If the door slams shut or shoot upward with force, the door is out of balance," and that "An unbalanced garage door may not reverse when required." If the door is out of balance, feels heavy, drops fast or will not stay put, stop and call a pro. Do not lift it again to check. Springs and cables are never yours to touch, adjust or replace. ## When a factory-insulated door is the cleaner answer If your door maker will not approve a kit, or you are close to replacing the door anyway, a door that comes insulated from the factory is the other route. What that costs, and what moves the price, is in [our insulated garage door cost guide](/blog/how-much-does-an-insulated-garage-door-cost), and what the R-value number on the label means is in [our R-value guide](/blog/garage-door-insulation-r-value-explained). ## What to put on any quote If you pay a pro to add insulation to your current door, ask them to: 1. Check the door's balance and springs after the insulation goes in, and rebalance it if needed. 2. Put that in writing on the quote, as its own line. 3. Tell you whether they checked with your door's maker, and what the maker said. ## What not to do - Do not add a kit before you have checked your door's warranty and asked the maker. - Do not adjust, wind, loosen or add turns to a spring to make up for the weight. That is a technician's job, every time. - Do not touch the cables or the bottom brackets. - Do not keep running the opener on a door that feels heavy or will not stay put. Stop and call a pro. ## What to do today 1. Find your door's maker and model, and pull up its warranty. 2. Ask the maker, in writing, whether adding insulation to your door is allowed. 3. If you go ahead, have a pro check the balance and springs afterward, and get that on the quote.