ᐅ How to Make a Plywood Balcony Surface Waterproof?

Created on: 19 Aug 2023 15:34
A
ateliersiegel
So far, everything is only planned, and nothing has been built yet.

For an extension of an exterior balcony, I am planning a thick plywood panel supported on posts, which will be made waterproof on the top and edges. Below it will be a terrace area that is meant to be covered by this structure.

If I build it myself, I want to prepare the roofing work (which should be done by a professional) as effectively as possible.

What is certain is that the edge of the base panel will be clad with titanium zinc sheet metal, and a plastic membrane will be applied on top. Water will simply flow over the edge and run down along the sheet metal, or be collected in a gutter (above the terrace).

The steel railing will be attached to the support beams underneath the plywood panel.

These beams can either extend all the way to the edge of the panel or stop 10 to 20 cm (4 to 8 inches) before it. To properly secure the railing, it would be best if they extend to the edge. Whether the roofer finds this practical for installing the sheet metal, I don’t know. The person I hoped would do this work has not responded (apparently quite busy).

Once it is built, it would be very impractical to change this afterward.

Whether the beams reach the plywood edge or are shorter is an open question. Based on experience, there will probably be additional details to consider one way or another ... but all this should be decided BEFORE the roofer starts.

I have an excellent roofing handbook, but I have not been able to find a solution to this specific issue in it. There are just too many possibilities.

I have been hoping for feedback from Mr. Fischer (the roofer) for several months.

The reason for this thread is that I am not sure how to proceed.

Although I don’t think this can be easily solved in a forum, sometimes it helps to talk things through….
ateliersiegel21 Aug 2023 09:17
Thank you, Karsten, for your comments regarding the roofer issue.
As mentioned above, I had already realized that I needed to have a discussion with the contractor before the work started.

When I am accused without reason of life-threatening behavior and am repeatedly called upon to delete the thread in outrage, I do not find that kind, but inappropriate. A note regarding your concerns might have been more reasonable.
K
KarstenausNRW
21 Aug 2023 09:30
ateliersiegel schrieb:

When I am accused without reason of life-threatening behavior and there are repeated outraged calls to delete the thread, I don’t find that kind, but inappropriate.
I did not call for deletion, but for the thread to be closed, including notes explaining what is considered dangerous (which is common elsewhere for similar issues). Instead, my posts were deleted and I received a warning for my request. No wonder there is hardly any traffic in this forum anymore, and many people have moved to other forums where there is much more activity.
When I was active here under a different username, there was significantly more activity and many more active participants.