Strengthening Roof Joists For Loft Conversion

The plan is just to put down some 18mm chipboard insulate the roof and board off the roof and eaves.

Strengthening roof joists for loft conversion. Lightweight and manufactured in the uk from recycled polypropylene to iso9001 standards and has been mechanically tested by independent experts. I have consulted a structural engineer and he has advised me that the loft joists are not strong enough to handle it and will need strengthening. This is part 2 in my series of loft conversion videos. Most roofs built from the late 1960s onwards are of prefabricated trussed rafter construction with distinctive w shaped webbing.

In this video i show how i cut my my joists make packer plates get the joists from the garden up int. If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists. A ridge beam is installed beneath the apex before the dormer roof joists can themselves be fixed in place and the roof weathered. You can do this by adding larger and stronger timber floor joists between the existing ceiling joists.

Sistering is the process of adding a new joist next to each existing joist. A 175mm loft leg fixed on top of a 100mm truss or ceiling joist provides a lightweight cost effective solution. Although once regarded as hard to convert on account of their relatively slender roof timbers typically only about 30 x 70mm many lofts of this type have been successfully. Developed by a team of engineers and designers the loft leg is strong.

Shafix design install 1 504 034 views. In the case of 2x6 joists you can pair them up with additional 2x6 joists by nailing them together side by side. Trussed rafters loft conversion.