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I-beam
Structural timber beam with an I-shaped cross-section, comprising softwood flanges and a web of a structural panel material such as KRONOPLY OSB. See TRADA Wood Information Sheet 1-42 for further information …...

Insects
Insects attack only very fresh or very dry wood. Insect attack can be favoured through previous fungal attack. A distinction is made between live wood insects, namely bark beetles and wood wasps, and dry wood insects, which include the house longhorn. ...

Insulation
Insulation is used for thermal, acoustic and fire protection. It can be made naturally-occurring or manmade materials e.g. pumice, expanded clay (Perlite), expanded slate, exfoliated mica (Vermiculite), foam lava, foam glass, rockwool, polyurethane foam, polystyral foam, phenylresin foam, and spun fibreglass. ...

Interstitial condensation
Interstitial condensation forms within structural elements, rather than on the surface.

Inverted construction
‘Warm’ construction, typically used for flat roofs where the insulation is located above the weatherproof membrane.