Joisties Fitting Tool | Steel Joists
Snap it. Align it. Install with confidence. 🧲
The Joisties Fitting Tool makes underfloor insulation installation easier and more precise by holding Joisties boards in place—so you can line them up perfectly every time.
🚛 Delivery direct to your doorstep
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Pickup available at Preston Warehouse
on Tuesdays and Fridays 8AM - 3PM🗓️ Availability: In Stock
🏅 70 years product warranty
Pairs well with
Joisties Fitting Tool | Steel Joists
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Product details
Description
Specification
| Joisties Fitting Tools | 2 tools |
| Size | 100mm x 25mm each |
| Material |
Aluminium WARNING: Fitting tools contain powerful magnets that are safe under normal circumstances. Please check with a medical professional before using magnets if you have a pacemaker, other medical device or artificial joints. |
| Designed and Made in | Australia |
Remember to check all specifications; warnings and instruction videos first to make sure products are suitable for your home.
Browse our ecoMasterClass pages for more videos and articles on underfloor insulation. Explore a range of topics on creating an energy efficient home.
How To Install
While some people work without fitting tools, it is harder to align Joisties so that they support insulation on both sides of the joist. These low-cost magnetic tools make a big difference in achieving an effective result so you gain the most benefit with the least fuss.
What you will need:
- Two Joisties Fitting Tools.
- Joisties.
- Joisties Adhesive.
- Polyester Insulation rolls.
Hacks:
- Use two Joisties Fitting Tools to save time and achieve the best outcome.
- Intact and glue-free Joisties Fitting Tools can be returned after use for a 50% refund.
How to fit Joisties with the Joisties fitting tools:
Our Part 3 of the 5 part series of installing Joisties demonstrates how to fit Joisties with the Joisties Fitting Tools.
Click here for more information and step-by-step instructions for installing under metal floor insulation using Joisties.
Delivery
FAQ
Frequently asked questions
Q: What are Joisties made of?
A: Joisties are made of polyester fibres compressed into a firm board.
Q: What R-Value are Joisties?
A: Joisties provide the standard thermal break for steel building elements of approximately R0.2
Q: Why do I need insulation as well as Joisties?
A: Joisties insulate the steel joists and hold the insulation in place. Joisties do not insulate your floor, they only insulate the joists themselves. You will still need bulk insulation to put between the joists.
Q: How do I install Joisties?
A: Click this link (video) so see how to install Joisties.
Q: What’s so special about the Joistie adhesive?
A: The Joistie adhesive has two very important qualities. Firstly, it’s low VOC. This makes it safe to use even in low ventilation spaces. Secondly, it has a very high “grab” so that means that once you stick the Joistie up, it will stay up. That makes it easy to get the job done.
Q: Can I use Liquid Nails instead of your more expensive adhesive?
A: Yes you can but we don’t recommend it. It will be much messier and take much longer. Liquid nails will not hold up a Joistie straight out of the cartridge. You will need to undertake the “contact adhesive method”. That is, apply the adhesive to the Joistie, stick it up, take it down, allow the adhesive to go tack free, (5 to 10 minutes) and then re-stick the Joistie up. Also, Liquid Nails is high VOC so is not safe in a low ventilation space.
Q: Must I use your Joistie fitting tools?
A: No, you can fit Joisties without the fitting tools. Aligning the Joisties along the joists so that they support the insulation on both sides of the joist will be much harder without the tools, but it can be done.
Q: How long does it take for the Joistie adhesive to set?
A: We recommend you leave it at least 24 hours before fitting the polyester underfloor rolls.
Q: How can I trim Joisties to length or to go around pipes and wires?
A: Joisties are easily cut with a sharp utility knife. When trimming to length, use another Joistie lapped over the one you are trimming. This will provide you a square guide to trim by. Rebates are also easily cut using a knife.
Q: How many Joisties are in a box?
A: Each box contains 20 Joisties. Each Joistie is 1m long so one box will cover 20 lineal metres of joists.
Q: How can I work out how many Joisties I will need?
A: Each Joistie is 1m in length. Measure the length of the joists and multiply by the number of joists to get the total lineal metres required. There will likely be sections of your floor with different length joists. It’s a good idea to make a sketch and write on your drawing the length and count of joists in each section of floor.
Q: How do I know how much adhesive I will need?
A: One cartridge of adhesive is enough for about 30 Joisties if you follow the recommended pattern of adhesive. It’s prudent to order an extra tube just in case you over apply adhesive.
Q: Are the powerful magnets on the fitting tools safe?
A: Under normal circumstances the magnets are safe. If you have a pacemaker or other bodily electronics or artificial joints it’s best to check with your medical professional first.
Q: How do I calculate how many joisties are needed?
A: Each Joistie is 1m in length. Measure the length of the joists and multiply by the number of joists to get the total lineal metres required. There will likely be sections of your floor with different length joists. It’s a good idea to make a sketch and write on your drawing the length and count of joists in each section of floor.
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.
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