Cracked window sil

[andymarshal]

Hi, i am going to have my bedroom window replaced however the concrete sil underneath ithas a crack exactly in the middle of it (this is due to a cracked lintel under neath it.

What should i use to fill in this crack as it lets the water into the brickwork below.

Thanks in advance

Andy

 

[Scrit]

Whatever you put in there I reckon that if you don't sort out the lintel you're asking for trouble as the weight being carried by that lintel is being transferred (in part) into the window or door frame beneath.

Scrit

 

[andymarshal]

Hi, i have replaced the orignal wooden lintel with an 8x4 rsj so the problem is solved. do you know what i should put in there?

Andy

 

[Thermo]

is it painted or bear concrete?

 

[Scrit]

I'd rake-out the joints, pack them with mortar then repoint. It might be worth checking the plasterwork on the inside. If that is badly cracked you'd be best chiselling back the plaster there and repeating the exercise you did on the outside - you'll have to repair the plasterwork around the new window, so yoiu might as well do the job right. Don't do the job until you are sure you'll get no overnight frost as that would banjax the mortar.

Scrit

 

[andymarshal]

hi, thanks for the help, i have re pointed the all underneath.

The cil is painted an awful yellow colour

What kind of mortar would you use ise there a special type? and what mix would you use?

Thanks

 

[Scrit]

Bear in mind I'm a chippy, not a brickie, here! I did a lot of this on my last house and the recommended mix was a 1 / 2 / 9 (by volume) mix of Portland Cement / Hydrated Lime / Sharp Sand. Mortar colour can be matched by varying the sand colour (e.g. for a white mortar use white river sand) and/or adding a colourant admix.
Scrit

 

[JohnD]

you might even think about getting a new precast concrete sill, bit more of a job fitting it, but might save you patching up every year forever.

 

[skybluescooby]

Or try these guys

http://www.the-plastic-surgeon.co.uk/tpsff/stonecareexamples.htm