Wolfin waterproofing solution for first floor extension - Projex
A relatively simple 1st floor addition at Holborow St in Croydon
Park posed some interesting detailing questions.
Firstly the owner/builder wanted his new balcony to be at the same level as the
internal floor of the house. Secondly he did not want any floor waste going through
the balcony deck but he still wanted a level deck. Thirdly he wanted to use stud
walls but was concerned about waterproofing the base of the studwalls.
The first problem was easily solved. The builder set the balcony 150mm below the
level of the internal floor, waterproofed the decking using the Wolfin System, then
created a timber decking system over the Wolfin Membrane (putting down strips of
Projex Shockmat matting under the timber battens to protect the membrane). The
finished timber decking was level with the internal floor level!
The second problem was also solved easily. He did not install a floor waste but did
allow the balcony floor to slope at 1/100 so water could flow into the adjacent box-gutter.
However he ensured that the timber decking itself was level. The timber battens holding the
timber decking had gaps in them to allow water to pass through so there would be no
damming effect.
Waterproofing the base of stud walls is always difficult because of the relative
movement at the horizontal and vertical join. The Builder used the Wolfin System
again - terminating the membrane 150mm up the studs and hanging it between the
studs. The outside of the stud wall was finished in Blueboard.
The Wolfin was chosen because of its ability to withstand the movement of the
lightweight materials used and also for its proven reliability in this type of
construction.
The Wolfin installation was carried out by Steve Mason of Abasco Waterproofing, an
experienced licensed Wolfin Applicator. Wolfin themselves were able to issue a combined
labour and materials warranty on the waterproofing - as opposed to the usual separate
labour and materials warranties.
Wolfin Membranes Australia can be contacted on 02-8336-1666 or mail@projex.com.au.
The Wolfin website is http://www.projex.com.au.
Steve Mason of Abasco can be contacted on 0417 221 700.
For further information contact:
Projex Group
phone: (02) 8336 1666
fax: (02) 8336 1670
web: www.projex.com.au
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