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Tips For Cutting Pir To Fit Around Floor Conduit Inc Bends


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#1 Cs111

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Posted 08 April 2016 - 03:57 PM

Laying floor insulation and I need tips for cutting the pir boards to fit snugly around conduit bends laid on the subfloor before 2nd layer goes on top.
Any tips.

#2 shell820810

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Posted 08 April 2016 - 04:00 PM

Either a bit of paint on the conduit and place the pir on top to leave the outline of the pipe, or press down slightly and put a dent in the pir where the pipe is.then cut. worked for us.

#3 declan52

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Posted 08 April 2016 - 04:14 PM

I used the denting it method. It's just one of them time consuming jobs that needs done.
A gd bench/table to set the sheets on when you are cutting will help you.
Make sure the floor is spotless or you will puncture the membrane.

#4 Cs111

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Posted 08 April 2016 - 05:25 PM

Thanks. Are you better to cut out a little trench in the insulation the depth of the conduit or actually cut right through the sheet and butt the insulation upto eiher side of the conduit then fill with sand/cement mix and cover with the 2nd sheet?

#5 declan52

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Posted 08 April 2016 - 05:45 PM

I just cut it right through then leveled it over with a weak mix and then covered with the 2nd sheet.
It would take some amount of time to cut channels out of the insulation. Might need to do it that way if you are limited with the depth you have to work with.

#6 Cs111

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Posted 08 April 2016 - 06:32 PM

What sort of mix? 4/1

#7 declan52

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Posted 08 April 2016 - 06:39 PM

Yeah but with hardly any water so it won't shrink that much. Just enough to get it mixing but still dry/crumbly looking.

#8 Cs111

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Posted 08 April 2016 - 06:50 PM

Cheers

#9 Woodgnome

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Posted 08 April 2016 - 08:52 PM

I would use insulation in the gaps and foam in, rather then a sand/ cement mix, as you are loosing your insulation depth at these places.