Waterproof part underground wood chip store

Joined
30 Jun 2014
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Location
Yorkshire
Country
United Kingdom
Hello,
I am converting an old soft sandstone (1 wall) and brick (3 walls) walled pig pen with concrete floor into a biomass wood chip store and want to make it waterproof. The ground outside surrounding the building is sloping slightly from level with store floor at one side, sloping up to about 1 1/2 feet above the store floor at the stone wall side. There is no damp course. The brick walls have no cavity and are 2 brick width thick and the stone wall is about 18" thick, with what I thick is sand and cement render on the outside. The floor and lower sandstone walls get damp in winter.

I have had all the pointing on the main house replaced with lime and sand render and had an almost daily rant from the tradesmen stating the cement should never be used on sandstone.

The internal walls of the store are in reasonable condition with a few recesses which will need filling. I am considering rendering the walls and then applying a tanking slurry to the floor and part way up the walls, e.g. say 2 feet above outside ground level.

In light of the previous tradesmen comments about cement and sandstone, I am thinking of painting SBR followed by a sand and cement render mix with SBR agent on the internal brick walls before applying a tanking slurry. But dont know what to do on the sandstone internal wall. Should I do the same as the brick walls, use/not use SBR, not use cement, but rather a lime based render (with or without SBR) or something else?

The store is reasonably well ventilated with vents high on the walls to allow the wood chip moisture not to condensate on the walls or ceiling.

Thanks
 
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