Planning the build
Why build an extension?
Initial design sketches
On-line Building Regs
Meeting planners
 Meeting building control
 Planning the foundations
 Planning the floor slab
 Marking out the footings
 Damp proof course issues
 Possible drainage problems?

 Construction of the walls
 Proposed roof structure
Windows diary
 Window challenges
 Initial window plans
 Making the casements
 Making the frame
 Designing leaded lights
 Making leaded lights
 Assembling the window
 The little window

 The door frame
Demolition diary
 The demolition starts!
 The demolition continues
 Still more demolition

Foundations diary
 Foundation issues
 Drain issues
 Digging the foundations
 Rethinking foundations!
 Pouring the foundations

Floor slab diary
 Rethinking the slab!
 Floor vent extensions
 Preparing the slab #1
 Preparing the slab #2
 Pouring the slab

Walls diary
 Preparing to build walls
 Build up to the DPC
 Build the walls #1
 Build the walls #2
 The gas men cometh
 Build the walls #3
 Finishing the walls
Roof diary
 Roof structure build
 Tiling the roof
 Finishing the roof
 Finishing the gables
 Roof insulation

 Floor screed
 Shower room
 Shower room floors
 Shower room walls
 Utility room
 Utility room walls
 Utility room floor
 Finishing the windows

Project finished!
 Final inspection
 The certificate
 Final thoughts

 Twelve months on!
 Material costs
Sister sites
 House re-roof project
 Home gas usage data

 Stop paint flaking
 DIY secondary glazing


Proposed roof structure

The roof will have a pitch of 45 degrees which will match up to the existing small roof overt the kitchen. The 100mm by 47mm ( 4" by 2") softwood roof joints will be spaced 400mm (16") apart.

The construction of the roof

The roof joists will held to the wall by the ceiling rafters at an appropriate head height. All the wooden elements will be held together with the appropriate steel plates and truss clips. There should be room for additional row of blocks on the inside wall to close the gap between the top of the wall and the roof joists.

The ceiling and roof insulation

I'm not sure whether I will put put insulation between the roof joists AND the ceiling rafters as it depends whether I will provide access to the roof space for storage space or not.

How the roof tiles are laid out

The clay tiles will be laid to match the style of the existing house. On top of the roof joists is laid a layer of roofing felt and the tile battons laid horizontally.

On my roof the battons are spaced at 10cm (2.5") vertically.

Details of the lead flashing at top of roof

A slot is chase cut into the wall using an angle grinder just above the top line f half tiles and the lead flashing inserted and bent down over the tiles for a flush fit. The slot is then filled with concrete. The barge board fits flush with the bottom of the tiles which overhang the sidewall by a little more than the thickness of the board.

Required roof metalwork:

Rafter Truss clips TCP50 from Simpsons to attach roof joists to the ridge plate.

Ridge-rafter connectors RR50 from Simpsons to attach the roof joists to the wall plate.

Joist hangers LUP230RR50 from Simpsons to attach the roof joists to the ceiling rafters

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