Reinforcing Floor Joists For Loft Conversion

I suspect that the depth of the loft floor rafters are only 90mm.

Reinforcing floor joists for loft conversion. So i m moving into a new property soon and i m looking at making use of the loft as it s a pretty decent size and i need a place for a workshop activities room. Pull out all insulation and any debris from all of the joist spaces so you can see the full length of each joist including where it meets the exterior walls. There is a 1 2 plywood sub floor on top of the joists. How to reinforce an attic floor with sister joists.

A new floor system is installed using a frame trimmer joists to support the floor joists that span the width of the loft. Each joist is connected by a vertical 2x4 to the roof rafter above it positioned about 4 from the wall. Loft conversions can i just lay loft boards down on my joists or will i need reinforcement on the joists. 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.

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. 6 loft conv rev 2 2007 support to loadbearing elements transferred from the roof partitions and 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.

I want to finish this space with drywall walls and ceiling and also a drywall ceiling in the garage under the joists. Also remove any blocking or bridging between the joists as applicable. The joists span 20 and are 16 on center. Clear the joist spaces.