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I've tried to find a thread on the forum about spray pu insulation without success. Does anyone have experience of it regarding cost and insulation values compared to PIR?

I'm planning to insert 140 mm PIR into my open panel timber frame walls. But i have so many studs at varying centres that i'm considering alternatives.

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Other suppliers: Isothane, Walltite.

 

Generally pretty expensive.

 

Consider cellulose?

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Are you looking at a DIY basis or getting a contractor in? 

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2 hours ago, gravelld said:

Other suppliers: Isothane, Walltite.

 

Generally pretty expensive.

 

Consider cellulose?

Is cellulose sprayed onto open panels?

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47 minutes ago, Alexphd1 said:

Are you looking at a DIY basis or getting a contractor in? 

Contractor. I'd need to compare price of contractor with time saved cutting PIR, and therefore labour costs.

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£30m2 @ 300mm thick is a number which sticks in my mind. Can't remember U value. You get a pretty good air tightness compared to hand cutting rigid insulation. 

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Some figures here:

 

 

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I think it could/would be a very good solution for on site timber frame build. It is possible to do a DIY (we are doing it) but you need a lot of m2 to make costs/work add up.

Edited by Alexphd1

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13 hours ago, Blob the Builder said:

Is cellulose sprayed onto open panels?

 

Yes, you can wet spray cellulose to open panels fairly easily.  Doesn't seem to have caught on here, but it's used elsewhere:

 

 

I've used DIY spray PU foam to help a friend insulate the inside of a steel boat hull years ago.  Not that difficult, but it does require a fair bit of practice to judge the expansion level.  It's pretty temperature sensitive we found, so that when we were getting to the end of the job, when the interior had warmed up a fair bit, the foam started to expand a bit more and we needed to speed up the application rate.  Even then we had to cut off loads of excess foam, we had dozens of sackfuls of trimmings where we'd cut the foam back to get it level with the battens that the lining was screwed to.

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