We have a patio on top of a cellar garage. The floor is a concrete slab. There is no leakage today and no water is left standing. The slope is 1cm/m. I want to build decking on top, and the question is whether it is wise to lay some form of waterproofing first. If so, what? The surface layer has received some damage, see picture. Should I fill them before doing anything else? Tips on product for that?
Something that prevents rain and snow from settling on the concrete is good. Just keep in mind that it's good if the concrete can breathe; placing a waterproof layer directly on the concrete can have some problematic moisture consequences inward toward the garage, considering any moisture that condenses in the construction cannot dry out. Think basement wall type.. Patching up damage is always good since damage leads water down that freezes and breaks off pieces, eventually the reinforcement starts to rust and it looks unattractive. Also, remember not to drill into the construction as it leads in moisture.
Thanks for the response!
A solution with, for example, metal sheeting between the studs might be good then? I think I've read about such a system here on the forum.
By the way, can I just place the studs directly on the concrete? Or should I put something in between?
Are there any tips for suitable filler to repair the damage with?
Imagine regular roofing sheet that covers the entire patio. The type of sheet that is angularly corrugated. Choose a pressure-treated beam that is thick enough to fit vertically in the ridges. If I've thought and "measured" correctly, the ridges on a regular roofing sheet should be about 40 mm wide? Rip the beams lengthwise so you get two long wedges from each. Or straight, the existing slope might be sufficient... In that case, you don't even need to rip any beam, just buy some form of batten instead...
Anyway, lay one part of the beams - or a batten - loosely on your repaired garage roof with appropriate spacing in between, then place the sheet on top and adjust the beams/battens so the sheet sits with its roof ridges on the beams. Then lay the second part of the beams - or another batten - on top of the roofing sheet, over the lower beams/battens. Drive screws through the upper beam/batten, through the roofing sheet and down into the lower beam/batten. Make sure that the valleys of the roofing sheet don't rest against the concrete. (This obviously depends on the thickness of the lower beam/batten.) Then lay decking timber on top of the beams. If you want to anchor the whole thing, make the beams long enough to project an appropriate length beyond the garage roof and build a fence with 45x70 or 45x95 standing posts that are partly attached to the projecting horizontal beams and either screwed to the garage wall or (if you don't want to drill holes there) anchored to the ground with ground spikes.
Could that work, you think? You should now have a rain-protected and ventilated garage roof and a nice decking floor to sit and relax on.
That sounds reasonable. I will probably go with that. Just need to measure a bit to make sure the entire construction fits under the door.
If I have seen correctly, roof sheeting of type tp20 has ribs that are 35mm wide. Then a regular 34mm decking board should work as a rule. Maybe a bit wobbly during the actual building, but are there any other disadvantages?
I think the weight will be more than sufficient to keep the whole thing in place, but if I decide to anchor it, it will be to the facade.
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