Skip to main content

Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Ask a question
Insulation

suspended floor boards insulation with PIR boards

Anonymous user 23/02/2024 - 3.35 PM

Hi There, Living in a 1930s house which has a ground floor that is raised approximately 50 cm above the ground. I would like to add Pir boards under the floorboards to not have cold air coming in from underneath. It's quite expensive so because of the price I wonder what thickness i should use ? I saw in a Kinspan video that i can use saddle clips to hold them in place. Can i use the expanding foam to fill the gaps between the boards the joists ? Thanks a lot for help M.

Are you a tradesperson and able to answer this question?

Log in

2 Answers

Js building and groundworks

Rating: 5 out of 5
St Austell
Personally I wouldn't use the spray foam insulation as it will cause the timbers to sweat and rot, 50m kingspan with a gap above will be adequate
Answered5 October 2020
0

Anonymous user

you can use kingspan and foam to the joints,you can also use a polystyrene boards. But you can't leave it like that. First, you need to use a membrane before putting kingspan or polystyrene board. Then place the material you want to use on the membrane. it would be best to additionally gently arm and pour cement.
Answered16 October 2020
0