ᐅ Construction of flat roof terrace insulation with living space below
Created on: 18 Jan 2013 14:25
K
kiningerFlat Roof Terrace Layer Structure with Living Space Below and Interior Insulation!
The following situation.
We are planning a basement with living space.
Above it is a flat roof terrace.
Now planners and flat roof contractors are debating the correct layering.
Background:
The terrace will be insulated from above using tapered insulation and bitumen waterproofing (warm roof), and is to be tiled.
The slab consists of waterproof concrete (WU concrete).
The living area below should be additionally insulated from underneath to meet the 2009 energy-saving regulations.
Structurally, nothing on the concrete slab can or should be changed anymore!
The whole thing should remain affordable as it is almost 100sqm (1076 sq ft).
Therefore, vacuum insulation or similar is out of the question due to cost.
Planner suggests:
From below in the living space, a vapor-open construction with a variable vapor retarder below the insulation, because moisture trapped between two vapor barriers could accumulate over the years.
Flat roof contractor suggests:
Completely vapor- and airtight from below, with a vapor barrier preferably >1500 Sd value below the insulation.
The situation is almost certainly that no drying occurs upwards and that the WU concrete slab + vapor barrier + bitumen layers form a 100% vapor-tight barrier.
The layer structure from inside to outside is as follows:
1 1.25 cm gypsum board (12.5mm)
2 1.25 cm gypsum fiber board (12.5mm)
3 2.4 cm air layer (static)
3.1 0.2 cm vapor barrier > vapor barrier or variable vapor retarder?
4 8 cm rigid foam, PUR, aluminum foil laminated
5 22 cm reinforced WU concrete (2%)
6 0.4 cm vapor barrier > is this even necessary if everything on the inside is also vapor-tight?
7 7.5 cm (on average) tapered insulation EPS 031
8 0.3 cm roof membrane, bitumen
9 0.5 cm roof membrane, bitumen
10 3 cm surface drainage
11 6 cm cement screed
12 0.8 cm composite drainage mat
13 0.5 cm thin-bed mortar
14 1 cm tiles (ceramic)
There are two opinions regarding the assembly of the slab and flat roof to avoid condensation.
Theoretical calculations say that neither assembly results in condensation. Theoretically!
Who is right in the long term, or what is the better approach?
The following situation.
We are planning a basement with living space.
Above it is a flat roof terrace.
Now planners and flat roof contractors are debating the correct layering.
Background:
The terrace will be insulated from above using tapered insulation and bitumen waterproofing (warm roof), and is to be tiled.
The slab consists of waterproof concrete (WU concrete).
The living area below should be additionally insulated from underneath to meet the 2009 energy-saving regulations.
Structurally, nothing on the concrete slab can or should be changed anymore!
The whole thing should remain affordable as it is almost 100sqm (1076 sq ft).
Therefore, vacuum insulation or similar is out of the question due to cost.
Planner suggests:
From below in the living space, a vapor-open construction with a variable vapor retarder below the insulation, because moisture trapped between two vapor barriers could accumulate over the years.
Flat roof contractor suggests:
Completely vapor- and airtight from below, with a vapor barrier preferably >1500 Sd value below the insulation.
The situation is almost certainly that no drying occurs upwards and that the WU concrete slab + vapor barrier + bitumen layers form a 100% vapor-tight barrier.
The layer structure from inside to outside is as follows:
1 1.25 cm gypsum board (12.5mm)
2 1.25 cm gypsum fiber board (12.5mm)
3 2.4 cm air layer (static)
3.1 0.2 cm vapor barrier > vapor barrier or variable vapor retarder?
4 8 cm rigid foam, PUR, aluminum foil laminated
5 22 cm reinforced WU concrete (2%)
6 0.4 cm vapor barrier > is this even necessary if everything on the inside is also vapor-tight?
7 7.5 cm (on average) tapered insulation EPS 031
8 0.3 cm roof membrane, bitumen
9 0.5 cm roof membrane, bitumen
10 3 cm surface drainage
11 6 cm cement screed
12 0.8 cm composite drainage mat
13 0.5 cm thin-bed mortar
14 1 cm tiles (ceramic)
There are two opinions regarding the assembly of the slab and flat roof to avoid condensation.
Theoretical calculations say that neither assembly results in condensation. Theoretically!
Who is right in the long term, or what is the better approach?
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