How to install polystyrene insulation

Jason
View the video

How to install polystyrene insulation

View the video
×

More D.I.Y. Advice

D.I.Y. slatted shelf unit 03:23

Living Room How to build a D.I.Y. slatted shelving unit This slatted shelving unit is easy to make, can be painted to match your décor and is a handy place to put items on display.

Finished bedhead attached to bed 03:09

Bedroom How to make a modern timber bedhead How to make a modern timber bedhead.

DIY firewood rack 02:30

Living Room How to make a D.I.Y. copper firewood rack Keep your firewood handy with this stylish copper storage rack. It’s easy to build and portable, making it easier to take outside and re-stack with wood.

modern living room makeover 01:29

Living Room How to give your living room a modern D.I.Y. makeover There are a few simple ways to freshen up a tired living room and make it a real feature in your home. You can create more space by knocking out a wall and updating the furnishings to fit. By adding floating cabinetry and open shelves, you’ll have m...

How to make a play table for kids 02:32

Bedroom How to make a play table for kids This toy table gives kids a place to play with their toys and it includes a handy space for storage tubs underneath.

wooden puzzle stool 03:23

Bedroom D.I.Y. kids wooden puzzle stool Create a fun play area for your kids with these wooden puzzle stools. All you need is some basic materials and a bit of know-how. Discover how with Bunnings.

modern laundry makeover 01:04

Laundry How to give your laundry a modern D.I.Y. makeover By giving your tired, old laundry a modern makeover you can make it a place you enjoy using. In this D.I.Y. renovation, we’ve created extra storage space with new cabinets, the tapware adds a stylish touch, while the external door will make this a m...

bookshelf storage 02:32

Shelving & Storage How to make a D.I.Y. kids wooden bookshelf This kids wooden bookshelf and storage unit lets you put your child’s favourite books or toys on display.

Project Overview

Insulating your floor with polystyrene panels is a cost-effective way to help reduce your heating and cooling bills. We show you how to trim the panels to size and install them between your floor joists. You will also see how to use brackets to support the panels in place.
Continue to step-by-step instructions
Time Required

Done in a Day

Done in a Day

You'll need to set aside a day to comfortably complete this project

 

Step by Step Instructions

1 Prepare your joists for installing the polystyrene insulation
2 Trim polystyrene insulation panels to size
3 Fit support brackets for the polystyrene insulation
4 Trim special shapes in the polystyrene insulation
  • Step 1. Prepare your joists for installing the polystyrene insulation

    Check to see if there is any plumbing or electrical cable installed on the sides of your joists. If you find electrical cable, cover it with wireguard waxed paper. If you find plumbing, cut a gap in your polystyrene panel that leaves 100mm of clearance to allow for future maintenance.
  • Step 2. Trim polystyrene insulation panels to size

    Polystyrene insulation panels come in different sizes to match the standard widths between floor joists. When you find a smaller width, trim the panels to fit the size required. Each panel has accordion edges, so you can easily trim them on either side with a standard trimming knife
  • Step 3. Fit support brackets for the polystyrene insulation

    Place a bracket once every 600mm on both sides of every joist, approximately 60mm below the top of the joist. This will hold the insulation panels in place just below the top of the joist. Nail the brackets in lightly. Then use a panel offcut to confirm your brackets are in the right position before nailing them in fully. Now put your panels in place.
  • Step 4. Trim special shapes in the polystyrene insulation

    Polystyrene insulation panels are easy to trim. For very thin gaps between joists, it is possible to trim the accordion edges on both sides. When the floor joists have an odd shape or overlap one another, you can simply cut a notch out where you need to.
save energy

How To Save Energy & Electricity How to save energy around the home We lift the lid on where you can save the most energy in your home, no matter who you are or where you live. These simple changes will help to reduce energy costs and keep your home comfortable all year.

Material for insulating your ceiling 01:31

Heating & Cooling How to insulate a ceiling Keep your home warmer in winter and cooler in summer by insulating your ceilings. We’ll show you all you need to know about installing ceiling insulation.

Woman filling small gaps with insulation 01:18

Heating & Cooling How to insulate walls Installing insulation in your walls is a great way to increase energy efficiency and reduce noise. Learn how easy it is to do yourself.

Person holding an utility knife 03:24

Heating & Cooling How to insulate your home for extreme weather Find out how easy it is to keep your home warm in summer and cool in winter with insulation.

Pet doors 02:54

Heating & Cooling How to create an airtight home To have an airtight home, you’ll need to prevent airflow leaving your home. We’ll show you some places which may leak air and what you’ll need to do to reduce it.

Man installing glass wool insulation batts underfloor into joists 02:55

Heating & Cooling How to install underfloor insulation batts Insulating your home can save you money and energy. Find out how easy it is to fit glass wool insulation batts under your floor.

Man installing pleated foil insulation 05:48

Heating & Cooling How to install underfloor foil insulation Insulating your home is a great way to save money on heating and cooling costs. Learn how easy it is to install foil insulation in your subfloor.

Trim Special Shapes 03:58

Heating & Cooling How to install polystyrene insulation Save money on your energy bills by insulating your home. See how simple it is to do the job yourself.

Rug 01:13

Flooring Ideas How to choose the right rug for any room A rug can add warmth, personality and really affect the look and feel of a room. The trick to finding the right rug for any room comes down to three things: size, colour and material.

Rug 01:08

Flooring Ideas How to make the most of your rug Rugs are a great way to add colour and warmth to a space. There are a few simple things you can do to look after them and make them last for years.

tiled bathroom

Flooring Ideas How to choose the right type of flooring With so many different types of flooring available, choosing the right type for your home is not easy. Whether your priority is function or style, there's a flooring option to suit every room in your home.

Man removing underlay from floor 01:39

Carpet How to remove carpet Learn the basic steps involved in removing old carpet.

Sanding timber floors with drum sander 03:57

Timber Floorboards How to sand timber floors Learn how to use professional floor sanding equipment to sand a timber floor.

05:32

Laminate & Vinyl How to lay laminate flooring Laying a laminate floor can be a relatively cheap, quick and easy way to update a room in your home. It’s relatively easy to do yourself and we’ll show you how.

Vinyl Plank Flooring Installation Centre Line 06:19

Laminate & Vinyl How to lay vinyl plank flooring Vinyl plank flooring is an affordable way to quickly install a nice new floor in your home. Learn how to install it properly yourself.

Dry lay the tiles before applying adhesive 04:49

Tiles How to lay floor tiles Tiles are a great way to bring colour and style to a room. We’ll show you how easy it is to lay floor tiles with this easy to follow guide.

D.I.Y. slatted shelf unit 03:23

Living Room How to build a D.I.Y. slatted shelving unit This slatted shelving unit is easy to make, can be painted to match your décor and is a handy place to put items on display.

Finished bedhead attached to bed 03:09

Bedroom How to make a modern timber bedhead How to make a modern timber bedhead.

DIY firewood rack 02:30

Living Room How to make a D.I.Y. copper firewood rack Keep your firewood handy with this stylish copper storage rack. It’s easy to build and portable, making it easier to take outside and re-stack with wood.

modern living room makeover 01:29

Living Room How to give your living room a modern D.I.Y. makeover There are a few simple ways to freshen up a tired living room and make it a real feature in your home. You can create more space by knocking out a wall and updating the furnishings to fit. By adding floating cabinetry and open shelves, you’ll have m...

How to make a play table for kids 02:32

Bedroom How to make a play table for kids This toy table gives kids a place to play with their toys and it includes a handy space for storage tubs underneath.

wooden puzzle stool 03:23

Bedroom D.I.Y. kids wooden puzzle stool Create a fun play area for your kids with these wooden puzzle stools. All you need is some basic materials and a bit of know-how. Discover how with Bunnings.

modern laundry makeover 01:04

Laundry How to give your laundry a modern D.I.Y. makeover By giving your tired, old laundry a modern makeover you can make it a place you enjoy using. In this D.I.Y. renovation, we’ve created extra storage space with new cabinets, the tapware adds a stylish touch, while the external door will make this a m...

bookshelf storage 02:32

Shelving & Storage How to make a D.I.Y. kids wooden bookshelf This kids wooden bookshelf and storage unit lets you put your child’s favourite books or toys on display.

Top of the content