'Non-setting mastic' is sometimes recommended for pointing ridge tiles as an
alternative to sand/cement, to allow for slight movement.. However, I don't
know where to find it - the only non-setting mastic I can find is Plumbers'
Mate - obviously unsuitable!
There are plenty of low modulus building mastics but they are not
'non-setting'. Can anyone suggest where I can get a suitable non-setting
Thanks. Might be OK, but seems designed for glass/metal/wood. Surfaces need
Ideally need something that bonds well to tiles/mortar.
Firstly, as mastic is a sealant and not an adhesive, I wouldn't advise
using it instead of cement for ridge tiles, especially in high-wind areas -
would you use the stuff by itself to fix a door or window frame (wood or
Secondly, whilst "low modulus building mastic" actually sets, if the
thickness of the applied mastic is correct, then there will be sufficient
'flexibility in the bead to maintain the weatherproof seal under all
conditions - and you will only get problems if you use very thin beads of
As for your original question, if the ridge tiles are properly packed and
fixed with the correct sand/cement/water ratio, then the tiles will still be
there even after very high winds.
On Friday, September 18, 2009 4:43:55 PM UTC-4, Cash wrote:
Just cams across this. You have to watch out for the acidity of the produc
t. I think that in the old days they would use a coal-tar based product so
it may not be an issue nowadays but take a look at non-setting mastic dama
ge and especially how it eats copper roof flashings (about halfway down the
On Friday, September 18, 2009 4:13:47 PM UTC+1, Steve wrote:
an alternative to sand/cement, to allow for slight movement.. However, I d
on't know where to find it - the only non-setting mastic I can find is Plum
bers' Mate - obviously unsuitable!There are plenty of low modulus building
mastics but they are not 'non-setting'. Can anyone suggest where I can get
a suitable non-setting mastic?Thanks
It comes in a plastic bag and it looks like a mass of small white polystyre
ne balls the size of pin heads mixed with some form of pink adhesive, textu
re is like putty density or similar to plasterseen. It never took on to exp
ensive and not very practical.
Never seen it use and when asked at the merchants if they had sold any they
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