05/08/2026
Sometimes (rarely 🤫) we make mistakes, but what sets us apart is how we deal with the issue. We won't run off with your money, we wont ignore your calls and we won't argue that everything is fine, when it's not.
What we will do is find solutions and fix the problem.
This raised area was built with a bitumen felt floor, which kept the under area watertight. Nice an easy, but it had got very old.
The client asked us if she could have a nice new deck, but keep the area below watertight. Of course! I said, never wanting to say no to anyone.
It all went swimmingly, looked amazing. Id come up with a way to fall the water between each joist to an underside gutter system and taken to a drain. For those interested, I attached battens to each side of the joists, with a decent fall. On top of those I measured nailed some marine ply. I then used exterior sealant to seal the edges and then gave it a nice thick layer of bitumin paint.
All good for a few weeks, client was happy. Then it started leaking.
Thinking water was passing between the edge joists and the fascia boards and creeping along the joins of the t&g ceiling, I took the fascias off and pretty much sealed every little nook and cranny I could find, convinced this would do the trick.
A couple of dry months later, it started leaking again. It wasn't just the odd drip, a decent amount was coming through, it needed sorting.
Many sleepless nights were spent thinking up ideas on a fix. Should I take the ceiling off and inspect from underneath, and plug any gaps? That would cost too much, t&g is cheap.
I decided that this would cause undue stress for a long time if not sorted properly. The only thing to do was take it up and see whats happening from the top. This meant fascias off, balustrades off, deck boards up. Fix problem and put it all back again. Absolutely galling, but it had to be done.
It turned out to be the right plan. The sealant I had used had failed. It hadnt adhered to the timber. The bitumin paint had diluted in the winter weather and was looking awful. Possibly a materials failure, possibly wrong time of year.
The plan to fix, paint again with a very generous amount of fibre reinforced roofing acrylic paint. Staple waterproof membrane over each joist gap and then joist tape over the staples. Roofing felt to also come right down the edge joists, add a pvc corner trim and then everything back together.
£80 in materials and one and a half days labour. All lost money, but absolutely necessary to have the job done right. And now I can sleep at night again!
So if anyone wants a watertight raised deck, I'm now incredibly experienced in what will and will not work!!!