What is the water demand of fresh concrete?
The water demand of fresh concrete is the amount of water per m³ needed to reach a given consistence. What affects it and why adding water on site is a mistake.
What is a union nut (pipe union)?
A pipe union joins two pipe parts with a loose nut, so you can disconnect a fitting without turning the pipe. How it works, how it seals, where it is used and fitting tips.
How to Make a Headboard for Your Bed
How to make a headboard: upholstered, reclaimed timber or panelled. Full guide with sizes, foam thickness, steps, wall fixings, costs and mistakes.
Fitting a wall-hung toilet with a concealed cistern: frame, duct wall and waste
Fitting a wall-hung toilet with a concealed cistern: all the sizes, the waste connection, setting the frame, building the duct wall and the mistakes you cannot undo.
What is mill scale?
Mill scale is the blue-grey iron oxide layer formed on steel during hot rolling. It must be removed completely before painting or coating, usually by blast cleaning.
What is wainscot oak (wagenschot)?
Wainscot oak (Dutch: wagenschot) is quarter-sawn oak, historically imported mainly from the Baltic region, valued for its stability in panelling, cupboards, doors and panel paintings.
What is a heat exchanger?
A heat exchanger transfers heat from one fluid to another without them mixing. Types (plate, coil, crossflow), uses in boilers, heat pumps, MVHR and cylinders, and maintenance tips.
What is thermal resistance (R-value)?
Thermal resistance (R) indicates how well a layer or building element resists heat flow, in m²K/W. Explanation of R = d/λ, adding layers together and the link with the U-value.
What is heat recovery ventilation (MVHR)?
Heat recovery ventilation (MVHR, Dutch: WTW) takes heat from extracted stale air and transfers it to the incoming fresh air. How the unit works, requirements, maintenance and common mistakes.
What is heat flow?
Heat flow is the amount of heat passing through a building element per unit of time, in watts. With U × A × ΔT you can work out how much heat a wall, roof or window loses.