Is it normal / acceptable practice to use internal mortar to mix with roof cement "as a smoother."
Cement for roofing
- Thread starter Mummymoomoo
- Start date
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I'm confused with your terminology.
Mortar is mortar. There is no internal or external mortar as such. There are differing cement strengths, water consistencies, sand types and admixtures, that all serve to produce whatever mortar is most suited.
What exactly is a a " smoother"?
Had some work done on verges and roof. Questioned "roofers" as found packet of "internal mortar" which I would assume should be used for internal cracks etc. Concerned they used this on roof as don't think would be as waterproof/ good as proper roof cement. They said they added this to cement to use as a "smoother." They said others use different additives. Think they said fairy liquid. Does that sound right?
Fairy liquid is for washing dishes! Mortar plasticizer is what professionals use.
Many people use differing mixes for differing jobs in different areas and climates. We for instance use a 4:1 mix of 'Cooks' building sand and cement with the aforementioned mortar plasticizer. Oh, and of course water, it works much better with water
If we are doing the flaunching on top of a chimney we add some sharp sand (also known as grit sand).
Many of my learned colleagues on here will have their own preferred mixes, we just find that works for us.
Many people use differing mixes for differing jobs in different areas and climates. We for instance use a 4:1 mix of 'Cooks' building sand and cement with the aforementioned mortar plasticizer. Oh, and of course water, it works much better with water
If we are doing the flaunching on top of a chimney we add some sharp sand (also known as grit sand).Many of my learned colleagues on here will have their own preferred mixes, we just find that works for us.
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Presumably this is the ongoing saga from your last post?
These guys truly are hilarious - to us at least!
The smoother is a plasticiser......in Geordieland we call it 'soap pooder' and indeed it used to be made by Procter and Gamble.
Its also acceptable to add PVA mixture if the job requires it, and the sand cement mix is as the others have recommended.
Sharp sand has a high shell content around here and is great for flaunchings.
Be lucky!
John
These guys truly are hilarious - to us at least!
The smoother is a plasticiser......in Geordieland we call it 'soap pooder' and indeed it used to be made by Procter and Gamble.
Its also acceptable to add PVA mixture if the job requires it, and the sand cement mix is as the others have recommended.
Sharp sand has a high shell content around here and is great for flaunchings.
Be lucky!
John
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