EXISTING DECK INSTALLATION - BETWEEN THE JOISTS

Between Joists

- This will divert most of water out of the deck area

( risk of leaks is coming from water at joist and aluminum corner ).

- Limitation: will not protect joist structure so as on top of the joists installation.

- Read and follow warnings on
https://goberco.com/products/warnings.html before each installation.

1

Material and tools:

Deck Membrane roll, 2'' x 2'' aluminum corner, window caulking, plastic run-out connector, neophrene washer roof screw, stapler, level, scisor, knife, chalk like, caulking gun.

2

If joist are leveled you will need to slope the aluminum corner so as caulking strip.
Proper drainage slope is between 1/8'' per foot (1%) and 1/4'' per foot (2%).

3

Install the aluminum corner (use stapler) over caulking strip.
To reduce chances of leaks, add caulking at the joist and aluminum corner junction.

4

Cut the membrane at the desired length ( to cover ledger board and rim joist). The membrane will need to be fold so make a mark at 1.5'' on each sides.

5

Fold the membrane as show ( these fold will be used to secure against the joist ). Goberco ASTM Low Density Poly Ethylene membrane can be fold without losing strength.

6

Install the plastic gutter run-out, start by making an X cut (make sure to not over cut). Mark is the inner side of the gutter run-out.

7

Secure the plastic gutter run-out to the membrane with 4 neoprene washer roof screws. We suggest to install the gutter run-out between 10'' to 16'' from rim joist.

8

The membrane strip with 1.5'' folds is ready to attach between 2 joists by underneath

9

First staple the membrane against ledger board with Z folds in closed position.

10

Staple the 1.5'' folds against the joists, membrane folds will meet the aluminum corner. Staple one side then the opposite Z folds against rim joist then the other side.

11

Screw a 1'' x 3'' over membrane folds and against the joists to support potential load (water, debris, iceā€¦) or under high wind conditions.

12

We pulled out some deck boards to show a top view of the drain membrane in place.