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Head plate
The top horizontal member of a stud partition.

Heartwood trees
Heartwood trees possess a regular coloured heart formation. The sapwood is wetter than the core. Heartwood trees include conifers such as pine and larch and such deciduous trees as the oak.

Horns
Extended door or window stiles designed to protect the corners from damage while in storage.

House longhorn
The house longhorn, also known as the longhorn beetle infests and can reinfest dry timbers in service. It is a widely distributed species found in North and South America, South Africa and Europe. Damage is caused by the larvae, which burrow into the timber from an egg laid on the surface. ...

Housing warranty and guarantee authorities
In the UK new houses are normally sold with a defects warranty. The two primary organisations providing this service are the National House Building Council (NHBC) and Zurich Municipal.

Humidity behaviour of wood-based materials
Wood-based materials expand as the humidity content changes, but to a much lesser degree than solid wood. Through equal moisture intake over the whole area of the panel, a change in length of 0. Mm/m must be expected for each 1% in the change in humidity content. ...

Hygroscopic
Wood is hygroscopic, i.e. it can absorb water and adapt its moisture content to the air humidity of its environment.