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PIR Floor Insulation


wozza

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Hi All,

 

Our floor make up was / is going to be 100mm Concrete, 100mm PIR and 75mm Screed 

 

We are considering increasing the insulation to 120mm and reducing the screed to 55mm

 

The UFH pipework will be fixed directly to the PIR

 

What are the pros and cons apart from installation time of using a 120mm PIR board vs using 20mm and 100mm boards combined?

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14 minutes ago, nod said:

To thin for semi dry screed 

Ok for liquid screed

 

Thanks Nod,

 

I should have said that the original 75mm  screen was most likely going to be a sand / cement, the new 55mm screed will be liquid screed.

 

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Or a well compacted sub base and structural concrete slab top?

Comfortably get 150mm insu then.

 

To answer your question OP you might overpay for 120mm sheets.

I'd price up 100mm and 25mm (if can lose 5mm) as quite common sizes. Otherwise if 120mm in one board same price then just go with that

 

 

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