This option is the most expensive as it requires the complex removal and rebuild of the existing roof.
Loft conversion how to strengthen floor.
Sistering is the process of adding a new joist next to each existing joist.
This could be a hip to gable loft conversion or a mansard conversion for example.
Changing the roof structure for a loft conversion.
We specialise in all types of loft installations including loft ladders new and enlarged hatch openings loft flooring loft insulation lights loft storage rooms.
A new floor system is installed using a frame trimmer joists to support the floor joists that span the width of the loft.
Strengthening attic joists for live loads by sistering.
If you are replacing the roof tiles at the same time you can insulate between the covering and the rafters which will also achieve good airtightness.
However the average dormer loft conversion with a double bedroom and en suite costs about 35 000 45 000.
A basic floor system is installed in about 10 stages from preparation to boarding the floor.
The plan is just to put down some 18mm chipboard insulate the roof and board off the roof and eaves.
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.