Jeezeeh95

Building a new house and next is insulation & wet UFH, followed by liquid screed (then wait 28 days before tiling) We'll be tiling all of the ground floor with the above set-up (wood effect porcelain tiles 120cm x 20cm) across 101m2 of floor area downstairs, however I'm not sure if it's necessary to spend £1k for Ditra Mat or some kind of membrane as well? Some tilers said I do, but most have said it's not necessary if using liquid screed - my questions for you guys are: Do I need a decoupling membrane? If so, which one would be best for my set-up as there is a lot of choices (Dira, Durabase, Mapetex, Strata etc) Is there a special kind of adhesive I need to use with liquid screed? (e.g. Kerakoll H40 Gel Adhesive etc) Apparently liquid screed creates a layer on top which needs to be sanded down, is this required or can a membrane be laid straight on top? Any help appreciated!

We're in the middle of a self-build new build in Hertfordshire, well insulated as per new building regs and we require an ASHP system. The house will be a 4 bed semi, currently me and my partner but with a view to have kids in years to come. Our estimated heat loss is around 5KW @ -2.5 degrees (estimates from lots of installers to gauge a price, a proper heat loss will be done prior to install) and we're looking to get a 250L cylinder as well (is this overkill for 2 of us and considering kids in the coming years?) We've been offered a lot of brands but after LOTS of research, i've whittled it down to a few but leaning more towards Vaillant as we can take advantage of the OVO 15p per KW tariff Other brands we've been told about are Ideal Logic, Bosch, Grant and a couple more.... but which one in your opinions would suit our project best? Happy to share more info or our floor plans to help me with this conundrum! Thanks! P.s. I found this PDF regarding the Vaillant + 250L cylinder, is this something I should reconsider? Which cylinders can go with ASHPs Vaillant.pdf