The construction of the houses has to besomewhat modified from houses in most areas.Inthe houses on the highway and in the noisiest areasof this site there will be a need for specialised doubleglazing and special acoustic seals will have to befitted to the doors.All exterior doors in this especiallynoisy pocket will have to be solid core wood doorswith hinges.Every house built on this site,not justthose adjacent to the highway or nearest to theairport,will require high density insulation materialsin the roof.Not only will all the roofs needinsulating,the exterior walls will be required to bedouble brick.All ceilings will require double thickness plaster board to be used in theconstruction.In the noisiest areas mechanical ventilation will have to be installed in theexterior walls.In those areas with sealed windows it will be necessary to fit fans with absorbersto cut out the noise in those particular houses.Air conditioning units could also be fitted in theceilings of such houses but this is substantially more expensive than fans,and may not beneeded on this site.