How best to fill gap

[SS]

See pic...

As you can see I am preping some woodwork ready for painting but while getting all the loose stuff off I find this gap where the wooden frame meets the wall. Whats the best way to fill this? Just with acrylic silicone OR use a `cement` filler and finish off with silicone? It is approx a cm wide the gap. My fear would be if using a `cement` type filler then damp could cross the gap and eventually rot the wood. Despite looks the wood is currently in good condition.

[IMG]

[The Natural Philosopher]

[IMG]

Acrylic decorator's caulk. - its NOT a silicone. Or an acrylic frame sealer suitable for exterior use. Both can take paint.

[stuart noble]

[IMG]>I always use cement based for this type of exterior filling. A sand/cement mortar with a dash of pva

[geraldthehamster]

If it's that wide, I'd mortar it in. For a narrower gap I'd use building silicone.

Cheers Richard

[Geoff Pearson]

[IMG]>I use Trowel Mastic, for example, one made by Sika. It is basically boiled linseed oil and sand mixed. It sets in some months but moves and is waterproof.

[Phil L]

[IMG] not found But now that you're here, go ahead and search through the billions of photos, images and videos on Photobucket.

no thanks

[The Natural Philosopher]

[IMG]

works, but cracks if wood shrinks

car body filler works too :-)

[stuart noble]

[IMG]>>>>>>>>>>

That stuff has become too expensive to use in bulk

[SS]

[IMG]> Page not found

Let my try the link again, sorry about that.....

[fred]

In article , Geoff Pearson writes

That's def the trad way and is what a tradesmen would use on large scale sliding sash windows in Scotland.

The more modern approach is foam for bulk plus frame sealant to seal. It's not a trivial gap so it would cost a fortune to do in gun sealant alone so I would use proper gun foam (far more controllable), cut back to a profile when cured then sealed with acrylic frame sealant.

One thing, decorators' caulk is wholly unsuitable for this kind of job, it's for indoor use only.

[Jonathan]

I have some in the shed that claims to be good for inside and outside.

Jonathan

[fred]

Thanks for the heads-up, historically that is quite unusual but I see Toolstation do some that is suitable for both interior and exterior use.

That said I'd prefer to use something described as a sealant for this type of job as it generally implies more flexibility than a caulk.

[The Natural Philosopher]

oddly enough I used it on the camper, and two years later is still fine.. and that's outside all year

[The Natural Philosopher]

frankly ive not found any real diffrence in properties

[Cash]

[IMG] on a gap that size (and with a timber window) I'd use timber quadrant, primed and undercoated all round and fixed to the frame, bring it up to a gloss finish with the rest of the frame and then run a bead of mastic twixt wall and quadrant.

A method I've found to be successful over many years.

If you want a belt 'n braces job, fill the holes with bit of expanding foam before fixing the quadrant.

Cash