Hello everyone,
we are currently planning a detached single-family house, and I am having some trouble with the roof design. I hope you can give me some guidance on this...
Here are the details:
The current house plan includes a shed roof with a pitch of 6° (6 degrees). The developer we want to build with is proposing the following roof construction:
- Structural timber made of glued laminated timber
- Boarding with tongue-and-groove boards
- Polyester fleece
- Waterproofing with 1.5mm (0.06 inch) Trocal SGK membrane
- Edge covering with aluminum composite sheet
I am not entirely comfortable with the waterproofing using the membrane and have suggested an alternative with titanium zinc sheet cladding. Unfortunately, this option was not well received by the developer—mainly due to concerns about noise during rain.
I have three pressing questions:
- Are my concerns about using the membrane justified, or is it just a perceived issue?
- Is the titanium zinc cladding really that noisy when properly installed and insulated (KfW 70 house standard)?
- Should I expect significantly higher costs when using titanium zinc cladding? As far as I know, an additional separating layer is required to ensure the roof’s waterproofness.
Thank you very much and best regards,
Hendrik
we are currently planning a detached single-family house, and I am having some trouble with the roof design. I hope you can give me some guidance on this...
Here are the details:
The current house plan includes a shed roof with a pitch of 6° (6 degrees). The developer we want to build with is proposing the following roof construction:
- Structural timber made of glued laminated timber
- Boarding with tongue-and-groove boards
- Polyester fleece
- Waterproofing with 1.5mm (0.06 inch) Trocal SGK membrane
- Edge covering with aluminum composite sheet
I am not entirely comfortable with the waterproofing using the membrane and have suggested an alternative with titanium zinc sheet cladding. Unfortunately, this option was not well received by the developer—mainly due to concerns about noise during rain.
I have three pressing questions:
- Are my concerns about using the membrane justified, or is it just a perceived issue?
- Is the titanium zinc cladding really that noisy when properly installed and insulated (KfW 70 house standard)?
- Should I expect significantly higher costs when using titanium zinc cladding? As far as I know, an additional separating layer is required to ensure the roof’s waterproofness.
Thank you very much and best regards,
Hendrik
Hello,
I cannot comment on the membrane.
Properly installed, rain is not an issue.
The additional costs are certainly considerable.
I am also planning a single-pitch roof with a 3.5° to 4° slope and am undecided between bitumen and metal.
In a conversation with a specialist company for metal roofing, it was pointed out that with the roof pitch I want, standing seam cladding is not a sufficiently reliable and permanently watertight covering.
I would estimate the cost for zinc standing seam cladding at about 100 to 120 €/m² (square meters) for finished work.
Currently, I am considering Kal-Zip, as it can be used for roofs from 2.5° slope.
Costs are about 80 €/m² (square meters) for finished work or around 40 €/m² (square meters) for materials.
Olli
I cannot comment on the membrane.
Properly installed, rain is not an issue.
The additional costs are certainly considerable.
I am also planning a single-pitch roof with a 3.5° to 4° slope and am undecided between bitumen and metal.
In a conversation with a specialist company for metal roofing, it was pointed out that with the roof pitch I want, standing seam cladding is not a sufficiently reliable and permanently watertight covering.
I would estimate the cost for zinc standing seam cladding at about 100 to 120 €/m² (square meters) for finished work.
Currently, I am considering Kal-Zip, as it can be used for roofs from 2.5° slope.
Costs are about 80 €/m² (square meters) for finished work or around 40 €/m² (square meters) for materials.
Olli
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