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dennistonnate
Mortor to field stone

I have a 140yoh. It has a fieldstone on all but one wall, this is cinder block. The field stone is in really good shape.

It is amazing what people could do with a pile of rocks and sand to make walls straight and strong for many years.

What type of morter mix should I use on the fieldstone to secure this all together?

Hank Bauer
Re: Mortor to field stone

Mortar dating back to that period would have been Quick Lime and river sand.
To match on todays standards if possible start with a sample and have a lab analyze it for make-up.
Second option is to use a type "O" mortar mix.
You can find these at Virginia Lime Works and U S Heritage Group. and Cathedral Stone.
Last and maybe not the best is to mix your own.
Start with this formular.
9 parts sand
2 parts sand
1 part WHITE cement
to adjust this mixture increase sand to a max of 12 parts.
In 1980 I used the following formular on the Church pictured on the front of Preservation Brief # 22 upper right corner.
19 Parts Sand
2.5 Parts Lime
1/3 Parts white cement
No problem as of this date.

dennistonnate
Re: Mortor to field stone

The origional part of the house only has sand.

That mixture is exactly what I was looking for.

Thanks

HoustonRemodeler
Re: Mortor to field stone

Check out the you tube videos on "parging" which is the name of the technique you'll be using for your field stone walls.

Hank Bauer
Re: Mortor to field stone
HoustonRemodeler wrote:

Check out the you tube videos on "parging" which is the name of the technique you'll be using for your field stone walls.

It is not the technique used it is the materials used that will effect the repairs.
Improper materials will cause more failure over time.
You must match the existing with the repair material.
80% of My work comes from improper material used in the past.

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