Would liquid screed take care of small bounce in PIR?

[AFT4B]

I have laid 135 square meters of 90mm PIR in readiness for UFH next week, which will be followed by Cemfloor liquid screed.

With a floor this size, I'm sure one can imagine the pig of a job this has been with cuts around doorways, walls, services, etc.

The floor is predominately block and beam with some areas of concrete slab. As anyone who has worked with B&B will know, the beams are bowed to allow for bounce/ suspension (?) which means the floor can never be 100% level even after the slurry poured to fill gaps between the blocks etc.

This inevitability causes a bit of bounce in the PIR in SOME areas. I have tried my best to make "relief cuts" and used expanding foam in gaps but the PIR doesn't sit down until some weight is on it. I have sand blinded the really bad areas/ low spots but there is still some movement.

I am of course time bound as both the UFH and Screed are booked. Should I continue to lose sleep over this or will the weight of the screed push/ keep it down? The depth of the screed will be 45mm. Help!

 

[noseall]

I have laid 135 square meters of 90mm PIR in readiness for UFH next week, which will be followed by Cemfloor liquid screed.

With a floor this size, I'm sure one can imagine the pig of a job this has been with cuts around doorways, walls, services, etc.

The floor is predominately block and beam with some areas of concrete slab. As anyone who has worked with B&B will know, the beams are bowed to allow for bounce/ suspension (?) which means the floor can never be 100% level even after the slurry poured to fill gaps between the blocks etc.

This inevitability causes a bit of bounce in the PIR in SOME areas. I have tried my best to make "relief cuts" and used expanding foam in gaps but the PIR doesn't sit down until some weight is on it. I have sand blinded the really bad areas/ low spots but there is still some movement.

I am of course time bound as both the UFH and Screed are booked. Should I continue to lose sleep over this or will the weight of the screed push/ keep it down? The depth of the screed will be 45mm. Help!

The weight of the screed will deal with it. If you want peace of mind stick a washered screw through into the blocks and pull it down.

 

[AFT4B]

The weight of the screed will deal with it. If you want peace of mind stick a washered screw through into the blocks and pull it down.

That's a great idea. Just a long enough concrete screw I guess?

Perhaps I'll do that for those that have more movement than I'm comfortable with.