the old stone firms mix which i was taught in the early 1970s was 7 parts stone dust /sand 5parts hydrated lime 2 parts white cement.use to be like spreading butter.
What mix would you use for ridge tiles fixing and pointing on a front door porch? Is that mix strong enough to stop them flying off in a British gale??
Use PHL 3.5 lime with 3 sand for historic buildings. PHL will set. Not NHL. Lime mortar is vapor permeable. Cement based mortar is not and will cause efflorescence in the stone/brick. PHL (pozzolain hydraulic lime [used by Romans for 2,000 years]) will set just like Portland cement mortar. In addition, this guy has the thermal issues resolved but NOT the vapor permeability. His 7-2-2-1 cement based mortar will expand and contract with the old stone, but will force water through the stone causing a leaching of minerals to the surface (efflorescence).
I got an old farm limestone/sand stone out building thats is crumbling in the lower two or three layers of stone. I need to strengthen the wall not make it look pretty. What mix should i use? I live in hot dry climate. I dont know if that makes any difference
It's not a bad mix though. 9 sand is being very generous and sensible. It's been found that buildings with sand ratios of between 9 and 13 sand to 1 cement have done really well. The addition of the lime hydrate will mainly act as a plasticiser and there's no difference between white and grey cement but... at least it's not a 1:1:4 or 5 mix.
the old stone firms mix which i was taught in the early 1970s was 7 parts stone dust /sand 5parts hydrated lime 2 parts white cement.use to be like spreading butter.
Thanks for the advice your 9/2/1 with white cement was perfect match
I would love to try this mixed
Is this a mix that would work with a sandstone ? Thank you for sharing your experiences with us!
What mix would you use for ridge tiles fixing and pointing on a front door porch? Is that mix strong enough to stop them flying off in a British gale??
what mix does Peter recommend for repointing?
Use PHL 3.5 lime with 3 sand for historic buildings. PHL will set. Not NHL. Lime mortar is vapor permeable. Cement based mortar is not and will cause efflorescence in the stone/brick. PHL (pozzolain hydraulic lime [used by Romans for 2,000 years]) will set just like Portland cement mortar. In addition, this guy has the thermal issues resolved but NOT the vapor permeability. His 7-2-2-1 cement based mortar will expand and contract with the old stone, but will force water through the stone causing a leaching of minerals to the surface (efflorescence).
Can that PHL be used to repoint a 1900 fieldstone foundation? Thanks
Thanks, how can I use , sand , cement or hydraulic lime for 1960 house if possible?
What is the compressive strength of this mix? What would you recomment for repointing limestone foundation/walls?
I got an old farm limestone/sand stone out building thats is crumbling in the lower two or three layers of stone. I need to strengthen the wall not make it look pretty. What mix should i use?
I live in hot dry climate. I dont know if that makes any difference
The lime mortar must always be softer than the material you are pointing.with limestone/ sandstone use nhl 3.5
@@soldier-Dave don't you think 3.5 would cure too hard for sandstone? Personally I'd use lime putty with pozzolan or hotlime
Can you tile on old lime mortar
That's a modern mix , most old stone work will be a hot mix , lime putty or a natural hydraulic lime 2,3.5,5 . It's a bit involved
Is this how they did the pyramids?
Yes
Hmmm its not really a traditional lime mortar then
NHL and cement!? No never!
Shouldn’t mix Nhl with cement
It’s not a natural hydraulic lime, it’s hydrated lime he’s using
He's not using NHL. He's using lime hydrate.
Cement should be nowhere near an old stone wall……lime mortar only
Nice pointing, shame about the addition of white cement
It's not a bad mix though. 9 sand is being very generous and sensible. It's been found that buildings with sand ratios of between 9 and 13 sand to 1 cement have done really well. The addition of the lime hydrate will mainly act as a plasticiser and there's no difference between white and grey cement but... at least it's not a 1:1:4 or 5 mix.
Was really interested to watch this until I saw he was using white cement in the mix