




Joisties | Steel Joists
Installing underfloor insulation with steel joists?
Forget staples, adhesives, or drilling—Joisties are the fast, secure, and hassle-free way to solve thermal bridging and hold insulation batts in place. Joisties are the ultimate insulation fix for steel joists!
🚛 Delivery direct to your doorstep
Couldn't load pickup availability
Pickup available at Preston Warehouse
Usually ready in 5+ days🗓️ Availability: In Stock
🏅 70 years product warranty
Pairs well with

Joisties | Steel Joists
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Product details
Description
At a glance
Typical Coverage: 9.0m2
Cost m2:
Dimensions:
Minimum Packs per Order: 1

Perfect for
🔹 Keeping Your Home Comfy – Helps keep your house warm in winter and cool in summer
🔹 Saving Money – Stops heat and cool from escaping, so you don’t need to use your heater or air conditioner as much
🔹 Soft and Safe – Made from soft, non-itchy polyester insulation that won’t cause allergies
🔹 Long-Lasting Protection – Strong and stays in place. Guaranteed to work for you for 70 years
Frequently Asked Questions
Can I insulate my floor if I have steel joists instead of timber?
Yes—you absolutely can! That’s what Joisties were made for. Traditional underfloor insulation is tricky with steel joists because you can’t staple into them. Joisties are a clever, system that deals with the thermal bridge from steel joists holds insulation batts firmly in place—no drilling or frustration.
Do I need any special tools to install insulation with Joisties?
Not really—just your standard DIY gear and a Joisties Fitting Tool, which helps you align and install the Joisties easily. Once they’re in, you simply slide the insulation batts into place. It’s a smart, DIY-friendly solution for steel-framed homes.
Is underfloor insulation really worth the effort?
Yes! Up to 20% of your home’s heat can escape through the floor. Underfloor insulation helps keep you warmer in winter, cooler in summer, and significantly reduces your heating and cooling costs. It’s one of the smartest upgrades you can make—especially when you’ve got the right tools to make it easy.
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