lime or cement mortar?
 

Until I watched Countryfile on Sunday and heard John Craven talking with
a company in Wales who make lime mortar and run courses etc., I was going
to repoint my 150 year old end terrace with cement. I think I have lime
mortar since it's a magnolia/yellowy colour.

I need to repoint inside and outside. Inside the plaster has blown and
the mortar is very crumbly. Was planning to

rake out old mortar
cover wall with cement render, pushing render into the joints
cover with insulated plasterboard.

If I need to avoid cement where can I get lime mortar.

Thank you,

Neil

lime or cement mortar?
 

If I need to avoid cement where can I get lime mortar.

You mix your own with cement and lime and sand. The proportions will depend
a bit on the sort of wall and property you're dealing with.

One suitable mix might be 1 lime, 2 cement, 9 sand by volume. Brickies might
dispute this, or have other ideas.

Rob Graham

lime or cement mortar?
 

In article , jacob
writes
Proper traditional lime mortar/render is not cement mortar plus bagged
lime as referred to earlier, but is slaked lime putty - available wet
and ready to use in various grades for rough work through to fine
mouldings etc. No cement content at all. Is available all over the
country e.g. in Derbyshire from Bleaklow Products. There are all sorts
of local variations -it is not consistent in quality like portland
cement.
If you are really keen you can buy quicklime and slake it yourself.
After slaking the longer you leave it the better it be. You can buy it
slaked as 'one year', '4 year', etc
Try browsing 'lime' 'lime putty' etc or try SPAB site (Soc. for
Protection of Ancient Buildings).
It is being used more often as it has been found that portland cement
mortar is incompatible with many sandstones . There is no doubt about
it and I have seen its effects often in this area - Derbyshire, with
crumbling stonework where pointed with cement mortar.

I'd agree with what Jacob has said, if it was lime mortar originally
avoid putting in cement it will cause more problems that it will cure.
The same goes for lime based rendering, replace like with like and don't
be tempted into a cement based stronger mix.
--
David

lime or cement mortar?
 

Niel A. Farrow wrote:

Until I watched Countryfile on Sunday and heard John Craven talking with
a company in Wales who make lime mortar and run courses etc., I was going
to repoint my 150 year old end terrace with cement. I think I have lime
mortar since it's a magnolia/yellowy colour.

I need to repoint inside and outside. Inside the plaster has blown and
the mortar is very crumbly. Was planning to

rake out old mortar
cover wall with cement render, pushing render into the joints
cover with insulated plasterboard.

If I need to avoid cement where can I get lime mortar.



You can buy hydrated lime at any builders merchant.

I actually have used a mix with about 4 sand to one cement and one lime.

Its proably completely wrong :)


Thank you,

Neil