Best approach to lime plastering?

[liam546]

I own a Victorian property, 9 inch solid brick, no cavity and it has lime mortar.


I have had issues with damp, I've hacked off plaster to 1.2 meters and allowed walls to dry out. Previous plaster was lime although in not 100% (does have hair in though)


I do not want to use bonding or modern gypsum plasters as these absorb to much moister and will show damp. I do not want to use sand and cement as this will block damp in wall and water will decay bricks or run elsewhere into joists.


I want to use a traditional lime to allow the walls to breathe, I spoke to a lime specialist and he gave me this advice....


Use R50 as a backing coat, push mesh into it, Allie to dry for a day. Then create a key using soft brush and then apply top lime coat, leave for another day and then do second top coat. Do this for downstairs and upstairs can just use a modern skim using modern plaster.


Unfortunately this guy is booked up for the rest of the year. Does anyone have any advice on whether this plan sounds good or if anyone else familiar with lime could have some input that would be great.

 

[johniosaif]

@seanlar

 

[stuy]

this is one route you can take but i would leave a little longer between coats, mesh is ok if you have problematic backgrounds i.e different sub straights wood ,stone ,brick etc.. as for upstairs i would also use lime but thats mine own view some people say dont bother but its done to cost!!! i would always try and bring the building back to how it was regards stuy

 

[seanlar]

I own a Victorian property, 9 inch solid brick, no cavity and it has lime mortar.


I have had issues with damp, I've hacked off plaster to 1.2 meters and allowed walls to dry out. Previous plaster was lime although in not 100% (does have hair in though)


I do not want to use bonding or modern gypsum plasters as these absorb to much moister and will show damp. I do not want to use sand and cement as this will block damp in wall and water will decay bricks or run elsewhere into joists.


I want to use a traditional lime to allow the walls to breathe, I spoke to a lime specialist and he gave me this advice....


Use R50 as a backing coat, push mesh into it, Allie to dry for a day. Then create a key using soft brush and then apply top lime coat, leave for another day and then do second top coat. Do this for downstairs and upstairs can just use a modern skim using modern plaster.


Unfortunately this guy is booked up for the rest of the year. Does anyone have any advice on whether this plan sounds good or if anyone else familiar with lime could have some input that would be great.

. Hi I would use lime putty 3coat work I will take a long time to dry if it has been wet for years . Try to find the reason for the damp there will be one get that sorted and you will be ok it's all about long term I hope third is some help to you rgs

 

[stokeplasterer]

hi , i dont know about the backing coat R 50 i never use any additives, the lime should be allowed to breathe, if you seal it one side it cant breathe so you are defeating the object - prepare the wall by removing all dust,paint, etc key the back ground by hacking or cutting, use a hydraulic lime with pozzlans this will set quickly, and then lime putty finish
seanlar has nailed it you must find the reason for the damp - is the ground level out side higher than the internal ? are the gutters leaking ? what area are you from ?
www.northstaffsplastering.co.uk

 

[stokeplasterer]

seanlar hi - do you ever use R50 ?? i never have ( to be honest never heard of it ) - do you use rend aid or pva or ruberoid prep for lime ?? i never have and never had a problem
seems to defeat the object of letting the lime breathe, whats your opinon ?

regards

 

[seanlar]

seanlar hi - do you ever use R50 ?? i never have ( to be honest never heard of it ) - do you use rend aid or pva or ruberoid prep for lime ?? i never have and never had a problem
seems to defeat the object of letting the lime breathe, whats your opinon ?

regards

. Done use any of the above just do it the old way . You just have to be patient with it .it's all about time and money these days .and in 25 years all these shortcuts done work long term . Doing it the right way long term it will pay off

 

[stokeplasterer]

totaly agree , thats the point in doing the right way first time.

 

[stokeplasterer]

just tried and failed to put a few pics on here , a job we have recentley completed using 107 tonnes of lime plaster and 500 m2 of lath and plaster on one private house - and the only additive we used was water lol

 

[seanlar]

Yep keep it simple

 

[stuy]

yep keep it simple is right the r 50 is part of the st astier system its a lime based under coat with polymer i think? as you both said find the problem and fix then coarse stuff and setting stuff would be fine stuy