Strengthening Roof Joists For Loft Conversion

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Strengthening roof joists for loft conversion.

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. You can do this by adding larger and stronger timber floor joists between the existing ceiling joists. Floor joists even if the loft was previously used for light storage you will almost certainly have to strengthen the ceiling joists in the loft floor.

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. The plan is just to put down some 18mm chipboard insulate the roof and board off the roof and eaves. In this video i show how i cut my my joists make packer plates get the joists from the garden up int. This is part 2 in my series of loft conversion videos.

A 175mm loft leg fixed on top of a 100mm truss or ceiling joist provides a lightweight cost effective solution. If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists. 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. It is at this stage when the dormer windows are being constructed that your loft conversion will be exposed to the elements so you ll need good temporary sheeting to protect against the weather.

A ridge beam is installed beneath the apex before the dormer roof joists can themselves be fixed in place and the roof weathered. Most roofs built from the late 1960s onwards are of prefabricated trussed rafter construction with distinctive w shaped webbing. Developed by a team of engineers and designers the loft leg is strong.