Sealing UPVC Windows

[screamer]

Just fitted a upvc window, but for sealing up under the cill, whats best to use?

i've fitted hundreds of wooden windows and just used trowel mastic, but i've read that trowel mastic is not so good for using on upvc??

if you say mastic, think it would take a good few tubes of mastic, where as i'd rather use trowel mastic if possible

(been away from joinering for about 12 years, so times change

 

[crank39]

Low modulus neutral cure silicone for sealing up often referred to as LMN.

How big is window if you think you'll need 'a good few tubes'?

 

[joe-90]

What's trowel mastic?

 

[screamer]

Low modulus neutral cure silicone for sealing up often referred to as LMN.

How big is window if you think you'll need 'a good few tubes'?

there's about 3/4" to seal up below the window.

the first window is 1800 long, i've another 2 at 2400 long


so, you wouldn't recommend trowel mastic?


Joe-90, trowel mastic is a linseed oil/sand mixture bought in tubs to seal below wooden & metal framed windows etc
http://www.beatsons.co.uk/building-...trow6rd-eve-trow6rd&utm_campaign=froogle#5359

 

[Burnerman]

I think for a 3/4" gap I'd go for trowel mastic or sand and cement really - if the upvc retracts a little or cracks away then its on with the LM silicone.
John

 

[screamer]

well, it looks like i got an answer from the everbuild site

Limitations
• Unsuitable for plastic frames heat absorbing glass.

sealant it is.

 

[joe-90]

Low modulus neutral cure silicone for sealing up often referred to as LMN.

How big is window if you think you'll need 'a good few tubes'?

there's about 3/4" to seal up below the window.

the first window is 1800 long, i've another 2 at 2400 long


so, you wouldn't recommend trowel mastic?


Joe-90, trowel mastic is a linseed oil/sand mixture bought in tubs to seal below wooden & metal framed windows etc
http://www.beatsons.co.uk/building-...eve-trow6rd&utm_campaign=froogle#5359[/QUOTE]


Cheers for that - never come across it.