As winter approaches, energy efficiency becomes a top priority for many homeowners in the UK. Installing spray foam insulation is one of the most effective ways to ensure your home stays warm during the colder months while keeping energy costs low. AB Building Products covers everything you need to know about spray foam insulation, from how it works to whether you can do it yourself, to help you make informed decisions this winter.
What is Spray Foam Insulation?
Spray foam insulation is a material that expands when applied, filling gaps and sealing air leaks in walls, ceilings, floors, and attics. It is commonly used to improve energy efficiency, reduce noise, and protect against moisture. Expanding foam insulation is available in two primary types: open-cell and closed-cell foam, each suited to different applications. Our Froth-Pak 600 Spray Foam Kit is a two-component closed-cell polyurethane spray foam system that comes in 2 disposable pressurised containers requiring no external power source.
How Does Spray Foam Insulation Work?
Spray foam insulation expands after application, creating an airtight seal that blocks air and moisture infiltration. This improves your home's thermal efficiency and helps prevent condensation inside windows and walls, reducing mould growth.
Closed-cell spray foam insulation is denser and offers greater resistance to moisture and air infiltration. It is ideal for high-moisture areas, like basements and lofts, or environments with extreme temperature fluctuations. In contrast, open-cell spray foam is more flexible and less dense, making it suitable for interior applications.
When to Use Spray Foam Insulation
Depending on your needs, spray foam insulation can be applied to various parts of your home and vehicles. Common areas include walls, basements, sheds, vans, boats and crawl spaces. Here's a breakdown of when to use spray foam insulation:
- Walls: It can fill gaps in walls and prevent drafts and dampness from creeping in, keeping your home warm and cosy.
- Sheds: Ideal for preventing excessive moisture and condensation, keeping your tools rust-free.
- Basements: For areas prone to moisture, like basements, closed-cell foam offers excellent resistance to dampness. Eliminating rising dampness can prevent condensation from appearing on internal walls.
Where is Spray Foam Best Used?
Spray foam insulation is versatile and can be used in new construction and retrofitting projects. Key areas where spray foam insulation is commonly applied include:
- Interior & Exterior walls: Try PENOSIL EasySpray DIY Foam Insulation to prevent air leakage, improve soundproofing and maintain a consistent indoor temperature.
- Crawl spaces and basements: Try the Froth Pak 180 DIY Spray Foam Kits, Where moisture resistance is needed.
- Around windows and doors: Try the PENOSIL 146 UNIVERSAL GUN FOAM to seal gaps and prevent air leaks.
By choosing the right type of spray foam for each area, you can maximise its benefits.
Which Spray Foam Insulation is Best?
The choice between open-cell and closed-cell spray foam depends on the specific needs of your home. Closed-cell spray foam insulation is typically the better option for areas that require maximum insulation and moisture resistance. It’s more rigid and durable, providing a higher R-value (insulation rating) per inch. Open-cell spray foam, however, is lighter and more affordable, making it ideal for interior spaces where moisture resistance is less of a concern.
Can You DIY Spray Foam Insulation?
Yes. While spray foam insulation is a highly effective product, many homeowners wonder if they can install it themselves. AB Building Products supplies DIY Spray Foam Kits with hose and nozzle sizes and all the protective wear you’ll require to safely apply the insulation properly. Here is a guide for what you will need for Do it Yourself Spray Foam Insulation:
- Izotup 600 Spray Foam Kits, are perfect for all metal surfaces to prevent condensation, such as shipping containers, narrow boats, van conversions, etc. The kit includes 180-size A & B Tanks in one box, a Spray Gun and hoses, 10 x Conical Spray Nozzles, a Wrench, and a thermometer strip to ensure the foam chemicals are at the correct temperature before and during use.
- Sealey - Half Mask with P3R Filter Cartridges with built-in exhalation vent makes breathing easy and comfortable without letting harmful materials in.
- Sealey - Disposable Coverall White Large protects skin and clothing during application, with an elasticated hood, cuffs and ankles.
- V-Maxx Safety Goggles Fit over prescription eyewear and can be combined with half masks.
- Draper - Large Nitrile Gloves protects hands during preparation and application.
- PENOSIL Premium Foam & Gun Cleaner effectively removes uncured construction foam from clothing, the foam gun, and surrounding surfaces.
Proper installation requires skill and precision. Improper installation can lead to gaps in coverage, reduce the insulation's effectiveness, or cause air leaks. Hiring a professional installer is often recommended for the best results, especially in hard-to-reach areas. Users of PU products are required to complete training and certification to ensure safe handling of diisocyanate-containing products. Once certified, you can continue using these products confidently. Take advantage of the free training available and stay compliant!
Preventing Condensation with Spray Foam Insulation
Condensation can be a significant problem during the winter months; poor insulation can lead to condensation inside windows or even condensation on walls, which can cause structural damage over time and promote mould growth. Installing spray foam insulation helps to regulate indoor temperatures and minimise moisture build-up. By creating an airtight seal, closed-cell foam can prevent cold air from seeping into your home, reducing the likelihood of condensation.
How to Prevent Condensation on Walls
- Ensure proper insulation in high-moisture areas like basements and bathrooms.
- Use a dehumidifier in areas with excessive moisture.
- Install closed-cell spray foam insulation to create a vapour barrier and prevent moisture from penetrating your walls.
Expanding Foam Insulation: What to Expect
Expanding foam insulation rapidly expands upon application, filling even the smallest gaps and cracks. This makes it an ideal solution for hard-to-reach spaces or areas where air leakage is common, such as around windows and doors. However, over-application can lead to structural issues, so it’s best left to professionals unless you have prior experience.
Spray foam insulation is one of the most effective ways to prepare your home for winter. Whether you want to improve energy efficiency, reduce noise, or prevent condensation, spray foam offers a versatile solution.