Diy Loft Conversion Floor Joists

The loft room will also have to be separated by a fire door either at the top or bottom of the new stairs.

Diy loft conversion floor joists.

If the board overhangs mark it at the centre of the last joist it crosses and make a straight cut at this point with a jigsaw. In the case of 2x6 joists you can pair them up with additional 2x6 joists by nailing them together side by side. There are many ways of altering roof structures for loft conversions but they all have one common element the ceiling joists will almost certainly be inadequate as floor joists. For most jobs 2 in 5 1 cm x 10 in 25 cm boards are an ideal size.

The new floor joists of your loft conversion will need to offer at least 30 minutes worth of fire protection which could mean replastering the ceilings in those first floor rooms below. The strong timbers approx 225mm x 75mm timber are secured to the wall plates brickwork and bolted to the walls. Cut the first timber to the required length the distance between the two steels and fix either side using jiffy hangers and repeat with the remaining joists. If you intend to board directly on to the joists instead of having a raise floor then start by placing the first board across the joists.

You ll use the same size lumber to assemble the rim joists as you will for the main floor joists. Once the joists are in all that remains is the noggins cut. A basic floor system is installed in about 10 stages from preparation to boarding the floor. We can now start installing the joists if you haven t already done so mark out the position of the joists at 400mm centres.

A new floor system is installed using a frame trimmer joists to support the floor joists that span the width of the loft. Trimmer joists form the periphery of the new floor. This means that new floor joists are fitted alongside them slightly raised above the ceiling plasterboard to avoid contact with it. Clearing the loft area of all debris insulation struts and temporary boards to expose the ceiling boards.

If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists. Remember to double up the joists where the stairs are going to be installed and to treble up the joists under the dormer walls of our loft conversion.