Simply gluing a vinyl membrane onto a deck is not good enough. The deck must then be further prepared for bad weather by using waterproof techniques.. This involves lots of different techniques to ensure plywood stays dry. Non treated wood needs to stay dry to prevent it from rotting. Rotted wood not only bad for the integrity of a deck, but can also be dangerous if rotting wood is a major structural point. This can be prevented by the following actions:
Apply Caulking To Waterproof Gaps
It is near impossible to avoid gaps when joining wood together without caulking. The area where a join is always going to have the slightest gap. Good carpenters can have virtually zero gap to the naked eye. Without caulking though these gaps are still susceptible to rain and other weather. Using a poly-urethane caulking such as Masterseal NP-1 will help seal any gaps at the joints. Poly-urethane caulking is a great choice for exterior construction work. Not only does it come in a wide variety of colours, it can also be painted once it has cured. Installed nicely and this is a great waterproof technique.
Install Counter Flashing Along The Wall
Counter flashing is designed in such a way that it creates a positive lap with the siding. This allows rain to run down and away from the wall. This helps stop water from getting behind the vinyl membrane and damage the wood underneath.
Counter flashing most commonly comes in black or white. It is made from sheet metal and will out last any weather thrown its way. If the flashing cannot be installed behind siding, then a bead of poly-urethane caulking is placed along the top edge.
Weld A Vinyl Patch Where Necessary
Once vinyl has been glued to the deck and the wall, there are going to be areas that are still susceptible to leaking. In these areas a small vinyl patch is welded into place to protect water damage. The patch is cut to size from the same vinyl membrane installed on the deck. The patch will have to be glued in any area where it cant be welded to the existing vinyl. The process of welding is done with the use of a heat gun. The patch is heated to a high temperature where it will melt. This fuses the two pieces of vinyl together creating a water tight seal.