Thursday – 05/08/21
With the expectations of some rainfall, the morning included a lot of intense work outside such as finishing off the foaming of thee windows and then beginning to tape over the foam with membrane tape, to ensure that no moisture would be through the aperture.
Inside the house, more internal walls were installed and the ceiling bolts began to get tightened, because they had only previously been hand-tightened. And down in the workshop more window reveals were getting built.
Outside, we also began the exciting task of setting out and beginning to lay the decking. The design of which had to be carefully considered to ensure not only longevity but also ease of construction. The timbers used were approximately 145x45mm: joists were cut to 1790 mm lengths, noggins into 554 mm lengths and finally timbers divided into two 70 mm width lengths. The following is a step by step description of how the base structure to the terrace was assembled:
- Wall plate
Screw wall plate to wall of house, so that the top of the wall plate is 170mm below floor level.
First, countersink two holes into the wall plate in front of battens.
Use 80mm screws to screw the wall plate to the battens.
*Ensure all battens are screwed tightly to wall
Use 40x50mm timbers for the floor plate.
Place the floor plate on the sleeper, with the 50mm dimension vertically placed, at a distance of 1745mm from the battens on the wall.
Put the screws at 600mm centres – 25mm from the edge of the batten (where the centre of the joist will be). After initially countersinking, screw on the floor plate using 80mm stainless steel screws.
Cut 400mm width pieces of DPM.
Staple to the sleeper with 45mm overlap over the edge of the external side of the sleeper.
Staple also to the inside of the sleeper, keeping the DPM at a sloped angle.
Mark the edge of joists onto DPM using chalk.
Place the joists on top of the floor plate and the wall plate, to the left of the battens fixed on the walls. This should be at 600mm centres.
Put three 3mm shims between the joist and wall.
Using 80mm screws, screw the joists into the wall plate by side spiking (screwing diagonally down into the side of the joist, through to the wall plate, about 50mm above the wall plate).
Place spacer blocks on to the sleeper wall so the noggin rests 25mm above DPM.
Place noggin on top of spacer blocks and in between joists, checking that the joists sit at 600mm centres and are square with the building.
Pre-drill through the joist towards the noggin to the one side, horizontally screw two 80mm screws through.
On the other side of the noggin side spike 80mm screws through the noggin into the previous joist, one high one low, being careful to avoid the previous horizontal screws into the last noggin.
Fix the newly attached joist to the floor plate by side spiking on the same side as the horizontal noggin screws, as the vertical of the pergola will be fixed on from the other side of the joist.