ASA Specialist Contracts provide Damp Proof Membranes (DPM) services throughout Essex, London and surrounding areas. DPM must be continuous with the Damp Proof Course (DPC) in the surrounding walls. 

A surface of blinding or soft sand should be used to avoid damage to the membrane both during installation and when the concrete or screed or other protective layer is installed. Care should be taken to ensure that the membrane is not stretched or displaced when placing the concrete or screed over the membrane. Sufficient allowance should be made to avoid creating areas of unsupported membrane.

Very reliable team that ASA Specialist Contract provided us with, great attitude and great work. 
Mrs Mitchell