What is mechanical stress?
Mechanical stress is force per unit area, expressed in N/mm². Explanation of tensile, compressive and shear stress, a worked example and rules of thumb.
What is a spanhuls (slotted drive sleeve)?
A spanhuls (hulsnagel) is a slotted steel sleeve driven into a drilled hole, for example to fix timber battens quickly to concrete or masonry.
What is spack (spray plaster)?
Spack (spray spack) is a machine-sprayed wall and ceiling finish with a granular texture, widely used in new-build housing. Explanation, method and tips.
What is spachtelputz?
Spachtelputz is a decorative plaster with marble grain and a synthetic resin binder, applied as a fine to coarse rubbed finish indoors and outdoors.
What is a space frame?
A space frame is a light, three-dimensional truss structure of struts and nodes that makes large spans possible.
What is a blind panel (spaarveld)?
A blind panel (Dutch: spaarveld) is a shallow recessed field in brickwork, often filled with decorative brickwork. Typical of Romanesque churches.
Home battery backup power: does your battery work when the power goes out?
Most home batteries deliver NO power during an outage. Here’s how to make your battery backup-ready: island mode, backup box, costs and runtime.
Comparing Home Battery Brands in 2026: Which One Is for You?
Comparing home battery brands in 2026? Sigenergy, Tesla, BYD, Huawei, Marstek and more on price per kWh, warranty, backup power and service.
What is a foundation arch?
A foundation arch is a masonry arch spanning between foundation piers, used to save bricks compared with a continuous wall. The Dutch term is spaarboog.
What is a pumped storage power station?
A pumped storage power station stores electricity by pumping water to an upper reservoir and releasing it through turbines when demand rises; 70-80% is returned.