External Plasticised Sheet P.V.C. Waterproofing Membrane Systems for Wet Areas
Outlet formed and
sealed to floor
April Shower tray
Brick hob installed inside tray on-site
External sheet membrane waterproofing systems are installed prior to the application of wall linings. This waterproofing principle has been in existence for hundreds of years the world over and is commonly known as a roof flashing detail.
External installed sheet membrane systems are better loose laid so as the membrane creates a slip joint over the substrate. In framed construction this is a huge advantage as the membrane will accommodate all differential movement that occurs within the building structure.
External installed sheet membrane systems are usually manufactured in a factory environment and then taken to the site and installed. These systems are perfect for bathroom, balcony and flat roof waterproofing.
It is well advised that people take advantage of any information offered by sheet membrane manufacturers and installers. The systems have been in existence overseas for many decades, they are proven, reliable and above all very effective.
A site visit is required so as all accurate measurements can be noted for factory fabrication.
All plumbing, drainage and electrical roughing in should be completed.
The areas to be treated should be swept clean of all building debris.
The main floor membrane is then laid over the substrate area with a minimum wall upstand of 100mm tacked to the framework or in the case of brick walls fully bonded to the wall edges.(NO BOND BREAKERS ARE REQUIRED)
After the floor membrane is installed a made to measure shower tray is then installed in the shower area. The shower tray is manufactured from thicker flexible material than the floor membrane and has a wall upstand of 150mm and a hob upstand of 100mm.
A wall membrane is installed over the face of the frames within the shower tray area, forming the required vertical internal corner flashing and extending to the nearest stud past the outside perimeters of the shower tray. This wall membrane must extend from a
height of 1800mm down lapping over the wall
upstands of the shower tray by 60mm. It is
important that the wall membrane has a
positive connection to the brass tap bodies in
the wall cavity.