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ConcreteDrBill

Hi You should always try and repoint with the same mortar as was used when the house was built. Cement: sand mortar are usually too strong and inflexible for use in older properties. When movement takes place, the mortar does not flex and the bricks or stone blocks crack instead. Also, cement mortar...

ConcreteDrBill

Agree - DONT PAY Just watering drymix concrete doesnt work, the top skin hardens but most of the fill stays dry. If the posts are not solidly fixed, the bond between the post and the 'concrete' is broken and will not re-form Either use a concrete mix that is mixed with water (not too much), or one o...

ConcreteDrBill

Usually 7 Newton strength (named after Isaac)

ConcreteDrBill

In the absence of any guidance from the conservatory supplier go for the 40N stuff, may be a bit belt and braces, but should help you sleep at night.

All the big boys (Lafarge, Tarmac, Hanson etc) seem to do both a 40N concrete and a lower strength one (Multi-Purpose?)

ConcreteDrBill

The concrete sound like a type of 'no fines' concrete. The traditional solution to waterproofing is to render it. Expensive, but permanent and usually reliable

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