kininger
2013-01-18 14:25:05
- #1
Layer structure flat roof terrace with living space below with internal insulation!
Following situation.
We have (in planning) a basement with living space.
Above it is a flat roof terrace.
Now the planner and flat roof waterproofing contractor are arguing about the correct structure.
Background:
The terrace is insulated from above with tapered insulation and bitumen waterproofing (warm roof), and is to be tiled.
The ceiling slab consists of waterproof concrete (WU concrete).
The living area should be additionally insulated from below to meet the Energy Saving Ordinance 2009.
Constructively, nothing can and should be changed on the concrete ceiling anymore!
The whole thing should remain affordable as it concerns almost 100 sqm.
Therefore, vacuum insulation or similar is out of the question here because it exceeds the budget.
Planner suggests:
On the underside in the living space, vapor open with variable vapor barrier below the insulation, because moisture would be trapped between two vapor barriers and could accumulate there over the years.
Flat roof builder suggests:
Everything from below completely vapor and airtight with a vapor barrier preferably >1500 Sg below the insulation.
The situation is certainly that nothing dries out upwards and due to the WU concrete + vapor barrier + bitumen sheets it is 100% vapor tight.
The layer structure is as follows.
From inside to outside:
1 1.25 cm gypsum board (12.5 mm)
2 1.25 cm gypsum fiberboard 12.5 mm
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 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 (average) tapered EPS insulation 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 construction of the ceiling and flat roof to avoid condensate.
A theoretical calculation states that no condensate forms in either case. Theoretically!
Who is (in the long run) right, or what is better?
Following situation.
We have (in planning) a basement with living space.
Above it is a flat roof terrace.
Now the planner and flat roof waterproofing contractor are arguing about the correct structure.
Background:
The terrace is insulated from above with tapered insulation and bitumen waterproofing (warm roof), and is to be tiled.
The ceiling slab consists of waterproof concrete (WU concrete).
The living area should be additionally insulated from below to meet the Energy Saving Ordinance 2009.
Constructively, nothing can and should be changed on the concrete ceiling anymore!
The whole thing should remain affordable as it concerns almost 100 sqm.
Therefore, vacuum insulation or similar is out of the question here because it exceeds the budget.
Planner suggests:
On the underside in the living space, vapor open with variable vapor barrier below the insulation, because moisture would be trapped between two vapor barriers and could accumulate there over the years.
Flat roof builder suggests:
Everything from below completely vapor and airtight with a vapor barrier preferably >1500 Sg below the insulation.
The situation is certainly that nothing dries out upwards and due to the WU concrete + vapor barrier + bitumen sheets it is 100% vapor tight.
The layer structure is as follows.
From inside to outside:
1 1.25 cm gypsum board (12.5 mm)
2 1.25 cm gypsum fiberboard 12.5 mm
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 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 (average) tapered EPS insulation 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 construction of the ceiling and flat roof to avoid condensate.
A theoretical calculation states that no condensate forms in either case. Theoretically!
Who is (in the long run) right, or what is better?