Header - It is a full brick or stone which is laid with its length perpendicular to the face of the wall.
Heading bond - In this type of bonding , all the bricks are laid as headers on the faces. The overlap , which is usually of half the width of the brick is abtained by introducing a three-quarter bat in each alternate course at quoins.
Hip rafters - These are the rafters which form the hip of a sloped roof. These rafters run from the ridge to the corners of the wall to support the covering over the hip.
Housed joint - In this joint , the entire end or thickness of one member is let into the notch in another. This is commonly used in works of heavy nature
Industrial building - These shall include any building or part of a building or structure , in which products or materials of all kinds and properties are fabricated , assembled or processed for example refineries , mills , dairies , industries etc.
Institutional building - These shall include any building or part thereof which is used for purposes such as medical or other treatment or care of persons suffering from physical or mental illness or disease. These buildings ordinarily provide sleeping accomodation for the occupants. It includes hospitals , sanatoria , orphanages , prisons , reformatories.
Insulation of sound - It is the control of noise transmission which is essential to minimise the disturbing effect of sound passing from one room to another through walls , partitions and floors or ceilings.
Integral damp-proofing - This consists in adding certain water-proofing compounds with the concrete mix to increase its impermeability.
Intercepting trap - This trap is provided at the junction of house drain (inspection chamber) and street sewer to prevent entry of foul gases from sewer into the house drain. This trap is thus provided to disconnect the house drain from the street sewer.
Intrados - Also known as Soffit , it is the under-surface of an arch.