Hello everyone,
We are currently building a masonry garage measuring 6x6m (20x20 ft) with a concrete ceiling and a 24cm (9.5 inches) brick parapet.
A slope towards the south is planned, and we have placed the drain pipe in one corner on that side.
After some research, I’m wondering if the slope is really necessary. It’s clear that a 2% slope is generally better than 0°. Insulation is not important to me.
A sloped screed would require several tons of material to be brought up and properly leveled, which could be done structurally. I’m still discussing this with the roofer. It will definitely cost a four-figure amount.
Insulation wedges as materials also cost four figures, and then you cannot easily apply the bitumen membrane with a torch. I haven’t found any affordable slope wedges without expensive thermal insulation ratings.
A zero-degree slope would be quite simple to create. The roof membrane would just need to be replaced every few years. In principle, this wouldn’t be complicated. Would gravel help on a flat roof with 0° slope?
What are your experiences with this? There are many unheated garages—do they all have insulation wedges?
Thanks!
We are currently building a masonry garage measuring 6x6m (20x20 ft) with a concrete ceiling and a 24cm (9.5 inches) brick parapet.
A slope towards the south is planned, and we have placed the drain pipe in one corner on that side.
After some research, I’m wondering if the slope is really necessary. It’s clear that a 2% slope is generally better than 0°. Insulation is not important to me.
A sloped screed would require several tons of material to be brought up and properly leveled, which could be done structurally. I’m still discussing this with the roofer. It will definitely cost a four-figure amount.
Insulation wedges as materials also cost four figures, and then you cannot easily apply the bitumen membrane with a torch. I haven’t found any affordable slope wedges without expensive thermal insulation ratings.
A zero-degree slope would be quite simple to create. The roof membrane would just need to be replaced every few years. In principle, this wouldn’t be complicated. Would gravel help on a flat roof with 0° slope?
What are your experiences with this? There are many unheated garages—do they all have insulation wedges?
Thanks!
Why not go green? Flat roofs with a 0% slope are ideal for green roofing, also serving as retention storage (with appropriate drainage elements), protecting the roof membrane, and naturally providing some insulation (though not as much as dedicated insulation materials). Depending on the type, they can also be almost maintenance-free.
I have done this myself, and so far it is working perfectly.
I have done this myself, and so far it is working perfectly.
Do you have to renew the roofing membrane every year?
I had the same issue with our 115 m² (1,240 ft²) garage roof area. Concrete slab, sloped screed, aluminum vapor barrier, insulation, and EPDM membrane. This is probably one of the more expensive options, but I hope I won’t have to do any more work on the roof afterwards.
I had the same issue with our 115 m² (1,240 ft²) garage roof area. Concrete slab, sloped screed, aluminum vapor barrier, insulation, and EPDM membrane. This is probably one of the more expensive options, but I hope I won’t have to do any more work on the roof afterwards.
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