week 9 unitec carpentry 18-20 may 2011

week 9. completing floor joists this week. floor joists are trimmed. boundary joists fixed all round the perimeter. openings for wc and shower outlets are trimmed. full depth noggins are fixed to prevent the floor joists from overturning. flitch plates are fixed at the joist butt joints along the middle bearer to strengthen the floor structure. underfloor foil insulation is laid before flooring sheets are fixed. we use a timber cradle template to form the 100mm drape to the foil which is required to facilitate condensation drainage and also forms the foil into a parabolic shape for better radiant heat insulation.

floor joists with noggins in position but need to be checked for correct alignment

fixing underfloor foil insulation with 100mm drape for condensation drainage

flitch plates are fixed to butt jointed floor joists at the middle bearer to stiffen the floors

close up view of underfloor foil insulation - note slots cut out for gluing to stop floorboards squeaking

simple timber cradle template used to achieve 100mm drape in foil insulation