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Dado
The lower part of an interior wall – usually defined with a moulded rail.

Damp-proof course
A water resistant material placed just above ground level in a masonry wall to prevent ground moisture from entering the structure.

Damp-proof membrane
A plastic or rubberised sheet material laid beneath concrete floors to prevent ground moisture soaking through.

Density
Mass per unit of volume, measured in kilogrammes per cubic metre.

Dewpoint
The temperature at which condensation forms, it depends upon the saturation of the air. Warm air can hold more water vapour than cold. Thus when warm air is at 100% saturation, a reduction in temperature …...

Differential movement
Different materials expand and contract in different ways due to thermal and moisture movement. In practice, a timber frame will shrink as the timber dries to emc and claddings such as brickwork may expand due to heat. ...

Distortion
Change in the shape of a piece of timber or timber-based material, e.g. bowing, twisting or cupping, brought about by shrinkage as the timber dries.

Drip groove
A groove cut or moulded in the underside of a door or windowsill to prevent rainwater running back to the wall.

Drylining
Board materials such as OSB and plasterboard mechanically fixed to a stud framework then directly finished without the use of large volumes of wet materials such as mortar and plaster. Advantages of drylining …...

Durability
In timber, durability relates to the resistance of timber or timber-based products to biological attack – by fungi, insects or marine borers. The classifications usually quoted refer to the resistance to fungal attack by the heartwood of a species only. ...