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The new concrete is intended to create a level surface/foundation for the wall, so at it's thinnest it will be 100mm (4") and at it's thickest 200mm over a distance of 9 meters (600mm wide). This is what needs to bond with the old concrete. Any advice on a mix for this application would be...

Thanks for the help, appreciated. Btw, cb9002, can you expand on what you meant by acid etching the old concrete, is this a formulation I can get from a normal builders merchant or is it a specialist thing? I get the advice about a cement slurry, but I thought I'd just check above first...

Hello. I wonder if anyone has any advice or experience of bonding old concrete with new. I want to build a low wall on a sound exisiting concrete base/foundation, this is because; 1. digging up the concrete is a major headache, 2. the base is at least 3-400mm deep and 100mm wider than the wall...

Thanks Ian, I'm glad I asked the question now.

Hello I'm planning to build a 9 metre long by 600mm (250-300mm thick) sandstone wall between two existing sandstone structures. The subsoil is a stable mixture of gravel and sandy soil. My question is how deep a foundation for the wall should be, and should it be hardcore/cement or just a...

Many thanks, very useful

Has anyone succeeded in catching moles ? I live on what is essentially a small island (with water surrounding almost completely), and share it with at least two moles who are trashing the garden between them. I have tried those sonic probes that are pushed into the ground and tubular mole traps...

Thanks for that Pete Since posting those questions we have discovered that over-rafting with insulation and a raised roof level will not get past the local conservation dept (understandably) and BC will not accept multifoils anyway as you say, so we are back to under-rafting. A u value of 2...

Thanks Oilman, I'll see how it goes.

Hello I am fortunate to have a sound 200 year old roof complete with an excellent condition oak and baltic pine structure, great original workmanship. However, I will be using the roofspace as habitable accommodation when it has been restored, and here is the question; The timbers are grimy...

Hello I'm about to embark on an expensive journey into roof insulation, if anyone has experience relevant to the following scenario, I will be really appreciative. I have an c1806 watermill which has two unconverted floors and an uninsulated roof so it acts like a heat chimney, hence the...