It has been a bit of a rush to complete all of the exterior tasks so that the scaffold can come down on Saturday. The very last job was fixing the Juliet balcony to the master bedroom. Sidney and his Dad came and made sure we got finished in time.
After the mad rush to get all of the floor insulation and heating pipes in place. On Thursday morning MPA Liquid screed arrived to complete the floor finish.
The product they used is called Agilia and comes from Lafarge. It is an anhydrite floor screed made from recycled plasterboard. when cured it is 3 times stronger than sand and cement once cured.
It’s big advantage beside its strength and environmental credentials is that is delivered as a liquid which can be pumped and so is much easier and quicker to install. The lorry simply discharges into MPA’s pump and then is fed through pipes to where it is required. Each lorry can carry about 7 cubic metres of screed. The basement and ground floor of the house used nearly 3 lorry loads.
Work started in the basement and it all gets a bit hectic once pouring starts. Apparently it is worth spending a lot of effort getting the preparation of the floor right so that the actual pour goes smoothly. My preparation was quite good but I should have taped all of the edges of the polythene. The liquid flows everywhere and can if not kept in check get under the insulation and lift it up.
A 50 mm layer is slowly built up over the sub-floor and once it is complete down in the basement the ground floor gets the same treatment. Because it goes down as a liquid it complete surrounds the buried UFH pipes. This means it is more thermally efficient than sand / cement as well, perfect for UFH applications.
The final step is to go over the whole pour and stipple the surface to give a mirror like finish. As Mike walked out of the house the back door was padlocked and the house left for 48 hours until the screed had set. After that time it is fine to walk on and continue the build process (much quicker than sand / cement). After about a week of drying out time it is ready for carpet / tiles etc. however you want to finish the floor. A great product expertly laid by MPA – minimum mess and all 254 sq metres done in 3 and a half hours!