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Hi Where are you my friend who is a gardener says look in local walls and
gutters for plants that are already growing locally in thin soil it will
proably be a sedum. 30mm of soil with 10mm of gravel is not much heaver than
tiles probably less than 100kg /m2 when soaked maybe some one else knows the
max load on bales. Roofing membranes. The range of options depend on the pitch of the roof and how sure you
want to be that it absolutely will
not leak and how long you want it to last. If you are doing anything other that a full commercial 25 year guarantee
job (see at the bottom) you can save money and worry, by using a “cold
deck construction”. You do this by introducing a ventilated space below
whatever deck (probably plywood) that you are going put the membrane on this
will enable any moisture from “SMALL” leaks and condensation to dry
out. Keep the insulation and final moisture barrier below the ventilated
space. This form of construction also allows you replace the green bit of the
roof without letting water in to the house if you have a disastrous leak. If you use cold deck construction and a pitched roof about 25 degrees
you can really cut corners and use any old scrap plastic (even bin liners) nailed
on like tiles and protected by old carpet. If you want to spend a bit more
(which I would recommend) use a semi rigid studded membrane (something like oldroyd
see http://www.safeguardeurope.com/pdf_datasheets/oldroyd_xv_datasheet.pdf)
or anything else you can find that is cheap. The studs trap water and stop the
earth slipping off. On a flat roof use anything elastic there are several rubber membranes available or
pond liners. As long as you prepare and protect the deck to avoid snags and
splinters and protect from sunlight you can use any flexible membrane. Avoid things
like builders DPM that are not elastic because unless you use lots of old carpet
as movement layers they may be damaged when the roof moves. Few of these things are environmentally sound but if you don’t nail
the flat roof membrane at all and only fix the pitched roof membrane at the top
edge at least it can be recycled. Sorry that there is not a simple answer but if you let me know the roof
pitch and what insulation that you are using I can send you a sketch. Patrick Note: Spec for a commercial guarantee job •
18mm plywood
deck. From:
strawbale-bounces@amper....muni.cz
[mailto:strawbale-bounces@amper....muni.cz] On
Behalf Of Amit Kvint Hi All, |