Hi,

I've checked out previous posts on uk.d-i-y but I'm still a bit unclear.
The original mortar sealing around my window frames (original c.1900 sash
and bay windows) has cracked and fallen out in several places, so I have
removed the mortar as part of overhauling the windows.

Looking through various posts, some people are advocating using frame
sealant, others recommend using mortar, whilst some suggest using a
combination. What should I be using for my windows?

Thanks,

Steve.

"spam" wrote in message
news:8df1e08a5698a1bf43835d4ef2aca04a@localhost

The original mortar sealing around my window frames (original c.1900 sash
and bay windows) has cracked and fallen out in several places, so I have
removed the mortar as part of overhauling the windows.

Looking through various posts, some people are advocating using frame
sealant, others recommend using mortar, whilst some suggest using a
combination. What should I be using for my windows?

There shouldn't be too much space between the frame and the brickwork as
the outside lining is part of a box that holds a sliding mechanism and
space is a premium.

You may find silicon effective but if there is a larger than normal
space mortar is the more effective filler.


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On Mon, 23 Aug 2004 22:18:54 +0000, spa wrote:



Hi,

I've checked out previous posts on uk.d-i-y but I'm still a bit unclear.
The original mortar sealing around my window frames (original c.1900
sash and bay windows) has cracked and fallen out in several places, so I
have removed the mortar as part of overhauling the windows.

Looking through various posts, some people are advocating using frame
sealant, others recommend using mortar, whilst some suggest using a
combination. What should I be using for my windows?

Thanks,

Steve.

I'm just completing more or less the same process. I ended up with a gap
between the brickwork and the frame that varies between about 7 to 10mm.
What I did was to fill this with mortar (1:4.5 masonry cement:sand) using
a dry mixture (to avoid it flowing out of the 6 ft verticals and the
upside-down bit at the top) and a pointing trowel. This mix is
(supposedly) equivalent to the 1:1:6 OPC:lime:sand mix usually suggested.

If it eventually shrinks back and opens a crack between the window and the
mortar, I'll follow up with a bead of frame sealant.

However, the problem I have is that a hairline crack has opened between
the new mortar and the brickwork in some areas. Is this because I was
using a dry mixture over the hot weekend and it's dried out too quickly ?
Is there anything I can do about this apart from chisel it out and try
again ? Sealant wouldn't look right here.

Cheers,

Phil Young

On Tue, 24 Aug 2004 14:55:57 GMT, "Phil Young"
wrote:


I'm just completing more or less the same process. I ended up with a gap
between the brickwork and the frame that varies between about 7 to 10mm.
What I did was to fill this with mortar (1:4.5 masonry cement:sand) using
a dry mixture (to avoid it flowing out of the 6 ft verticals and the
upside-down bit at the top) and a pointing trowel. This mix is
(supposedly) equivalent to the 1:1:6 OPC:lime:sand mix usually suggested.

If it eventually shrinks back and opens a crack between the window and the
mortar, I'll follow up with a bead of frame sealant.

However, the problem I have is that a hairline crack has opened between
the new mortar and the brickwork in some areas. Is this because I was
using a dry mixture over the hot weekend and it's dried out too quickly ?
Is there anything I can do about this apart from chisel it out and try
again ? Sealant wouldn't look right here.

Hi,

I'd stick a strip of wood/foam etc round the frame that goes 5mm
deeper than the surface of the brick. Then when the cement dries
remove it to leave a 5mm deep channel, put a strip of PVC at the
bottom then fill with sealant to create an expansion joint.

A wood/uPVC frame will move with humidity/temperature so cement alone
will never give a good seal.

cheers,
Pete.