Thank you Mr Punter,
When I asked why they never put membrane? The answer was it is not necessary, so after the foundation I asked them to stop the work.
From now on I will build it by phrase and will be there. No that the foundation is finished can I put Everbuild 908 Black Jack DPM. The location of the plot is in Turejeng.
We are living now in Scotland but we bought a plot of land 20m by 20m in The Gambia "West Africa" as a retirement plan. Last year we started with the foundation but for reason that I dont know, they never put membrane. Please any help. Many thanks