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    New build hybrid heating system - badly configured?

    Hi, I've moved into a new build, built by CALA Homes. Overall, the house is great, but I'm not so sure about the heating system. Outside there's a Daikin air-source heat pump. In the garage there's a gas boiler. Upstairs there's a hot water storage tank. Concern 1: The heat pump only heats...
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    Retaining wall foundation depth

    Hi, I'm building a low retaining wall. Over the length of the wall (17m), the height I'm retaining goes from 550mm down to zero. I have plenty of 7n 100mm dense concrete blocks, and I'm planning on 3 courses above ground. What depth of concrete foundation would you recommend. The soil is clay...