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Central Heating

concrete subfloor below 100mm insulation for UFH is uneven by 1cm at few places

Anonymous user 28/02/2024 - 3.55 PM

concrete subfloor below 100mm insulation for UFH is uneven by 3 or 4cm at few places. We will be laying pipes and screed on the top of insulation. Would screed push insulation firm against concrete or there would be void underneath. I am concerned if screed does not push insulation to concrete, can this cause tiles to subside over time? Any advice would be appreciated. Thanks R, I could not find reply link so decided to change the question. We are using 100mm insulation and 65mm screed on insulation. The floor below insulation is uneven by good 3 or 4 cms.

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3 Answers

RAS plumbing and heating

Rating: 4.9 out of 5
Nottingham
How thick screeds going down?
Answered16 November 2020
2

S G services

No reviews yet

South Ockendon
Yes the waight of the screed will hold insulation down. But for good measure why don't you fill the gap below with sand.
Answered9 December 2020
1

Greg Snape Building

Rating: 5 out of 5
Retford
I would suggest laying a self leveling coat down first.
Answered9 December 2020
0