Can RockWool Touch Wunda Metal Spreader Plates?

[Rehan Saeed]

I'm having Wunda metal spreader plates under my floor boards for the first and second floors. I'm also insulating the floor with Rockwool Flexi.

 

I talked to Nu Heat who say that Wunda spreader plates can sag over time and lost contact with the floorboards. Would it be a good idea for the Rockwool to come into contact with the UFH spreader plates and help keep it pushed up?

 

Wunda tell me that there should be a 20mm gap between the spreader plates and the Rockwool, so that it doesn't make any noise. Would Rockwool really make noise? It seems so flexible.

[Nickfromwales]

6 minutes ago, Rehan Saeed said:

I'm having Wunda metal spreader plates under my floor boards for the first and second floors. I'm also insulating the floor with Rockwool Flexi.

 

I talked to Nu Heat who say that Wunda spreader plates can sag over time and lost contact with the floorboards. Would it be a good idea for the Rockwool to come into contact with the UFH spreader plates and help keep it pushed up?

 

Wunda tell me that there should be a 20mm gap between the spreader plates and the Rockwool, so that it doesn't make any noise. Would Rockwool really make noise? It seems so flexible.

Rock wool is fine, the sound issue is non-factual. I recommend installing 20mm too much of the rock wool to make the plates become a little ‘distended’ and promote great surface to surface contact. 
My preference is to get to the underside and staple the plates to the deck boards, using thousands of staples to keep things in place for the duration.  
Can you access these from underneath?

[Rehan Saeed]

8 minutes ago, Nickfromwales said:

Rock wool is fine, the sound issue is non-factual. I recommend installing 20mm too much of the rock wool to make the plates become a little ‘distended’ and promote great surface to surface contact. 
My preference is to get to the underside and staple the plates to the deck boards, using thousands of staples to keep things in place for the duration.  
Can you access these from underneath?

We're putting down new plywood sheets, so this might be possible but the sheets are heavy, so not sure how practical it is to install like that.