| A. |
Tiled Decks or
Balconies (not over occupied space) |
| 1. |
Deck
must be sloped 1/4" to 1/2" max. per foot towards
the drainage system. If plywood is already in place
and not sloped, use a pre-slope of wire lath with sand and
cement to achieve proper pitch. |
| 2. |
Adjacent flashing must
be in good condition and the COMPOSEAL GOLD membrane must be properly sealed or "tied
in" to all existing flashing, drain, gutters, and pipes. Compotite’s Elastiseal
is manufactured for this purpose, providing a "gasket type" seal between the PVC
membrane and metal, glass, rubber, concrete, ceramic tile or most painted and primed
surfaces. Be certain water cannot back up under the tile installation and freeze. Drainage
must be complete with no standing water at any time. |
| 3. |
Plywood
substrates (min. 3/4" to 1" thick or two 1/2"
boards) expand and contract at greater rates than cement mortar
and should be isolated from the tile installation to prevent
debonding and cracking. This can be accomplished by: |
| |
a. |
applying a 1 1/4" to 2" wire-reinforced
mortar bed directly to the plywood, then bonding COMPOSEAL GOLD atop the mortar, or |
| |
b. |
placing cementitious backer units
(CBU’s) atop the plywood, then bonding COMPOSEAL GOLD directly to the CBU. |
| B. |
Tiled Roof Decks
Over Occupied Space |
| Nos. 1 and 2 above are
required. |
| 3. |
For
waterproofing tiled decks over occupied space with COMPOSEAL
membranes, a wire- reinforced mortar bed (1 1/4" to 2"
thick) above the membrane is required. Exactly the same procedure
as installing an interior tiled shower should be followed.* |
| COMPOSEAL BLUE
Shower Pan membrane is recommended for this purpose, as bonding to the substrate is not
required. |
| C. |
Interior Use of
COMPOSEAL GOLD over Plywood |
| Interior tile
installations over plywood substrates also require extra precaution. Please follow step A.#
3 above, method a or b. Note that heavy point loading should not be allowed on ceramic
tile installations over plywood. |
