26th June

Tools used: radial saw, hammer, 8m tape, drop saw, dog tail, straight edge, level, F clumps, gas nail gun, hand saw, hand plain

First part of the day we started on calculations on the length of the roof clading and the number needed to cover the build.

First we went over the roof over hang / 600mm + 30mm [facia width] + 60mm over hang of the roof clading = 690mm

Then we added this to the run [half the width of 7.2m = 3.6m] = 4.290m or 4290mm
then to find the length [or hypotanuse]  4.290 divided by 20 degrees cos = 4.565m [take of 10mm of the roofing iron sheet to give us 4.555m]

Then to find the area of the roof we took the length of the build 15.5m added .690 [over hang] x's 2 = 16.88m / then the side - 7.2 + .690 x's 2 = 8.58m / x's these together 16.88 x 8.58 = 144.83msq

Then to find the area with the pitch 20 degrees we took 144.83m x cos 20 degrees = 154.125msq [this is the roof area of our build]

Next we worked out the number of sheet required. Each sheet has a cover of 760mm [which means its the width after over lapping the sheet next to it]. We took the length of one side - 16.88m divided by .760 = 22.210 / x's 2 = 44.42m plus 1 full length per end which gives us a grand total of 46 sheets @ 4.555m / off cuts go to opposite side.

We then worked out  the paper quantity. Rolls are 1250mm wide [cover 1m] rolls come in 50msq
50msq x's .8 = 40msq / pitch roof area = 154msq divided by 40 = 3.85 round up to 4 - so 4 x's 50msq rolls of paper.

Rest of the day was spent building. Demolotioning our close couple roof exercise, as well as de-nailing each member. Then went through the build nailing the bottom of the trusses to the top plates. We run a string line and blocks to check the walls were straight, adjusted when required using F clumps to pull any truss down down, then nailed from the bottom when we could and top on the other ones with a gas nail gun.

 

Last we had to adjust a stud where the kitchen units are going, by cutting with a hand saw no more than half way through the stud [internal part of the bow] then we nailed a member to 1 side [min of 300mm member from the cut - 1 each side] 2 nails at the top / 2 nails at the bottom and 1 in the middle. Then the stud was pushed to straighten. Nailed the bottom off [same as the top part] checked with a straight edge / nail the top of the other member at the top / when checked if straight a wedge was put in the cut / checked again / when straight the bottom part was nailed in / wedge knocked off.
Finished with a hand plain taken any edges off.

     

Today we went to ITM truss and frame plant.
We  seen how they made the trusses for the roofs and frames for the walls. It was interesting to know that only selected places [people] can build trusses [for roof]
Upon coming back to class we talked about wood [pinus radiata] and why it was used extensively within the NZ building trade.
Then we talked about MSG [machine stress grade] and the levels, 6 to 12 being the best quality. MSG10 was the one used to make the trusses and frames.
After that we went over the timber treatment scale - H1.2 the treatment level used on the timber used to make the trusses and frames up to H5 that is treatment used for the timber used in the structure that is in the ground. We also looked at the chemical [used to treat the wood, and the colours of the wood from these treatments / H1.2 pink, H3.2 to H5 green], tothe level of exposure the different grades can  take [near to none up to being in the ground] and then the Bio hazard each treatment protects the timber from decay to insects.
In the afternoon we went over Pythagorus Theurum [right angle triangle] a squared + b squared = c squared or c square - a squared = b square / c squared - b squared = a squared
    Also how to set up a builders level, placing the 2 front parts of the level over the 2 legs of the tripod with the other part over the third leg, then leveling it up by the dials on the sides to place the air bubble in the middle of the circle. repeat moving the level around in 90 degree sections keeping the bubble in the middle.