Captain's Table

Mark Austen

2021.04.21 - Workshop Apex Repair - Part 6 (Edited)

We are getting close to having the capping on the top of the workshop and once that is done it needs to be fixed in place so that high winds do not blow it off. The intention is to use 10mm studding screwed into the threaded holes that were drilled into the spine and to clamp the capping on the inside to the two nearest purlins. To do that I need to make six battens that will span the purlins with an 11mm hole drilled through the centre. The studding will pass through this hole and a nut and washer fitted so that the batten and capping are drawn together as the nut is tightened clamping the capping to the roof.

As usual I needed to make a pattern for the batten so a suitable length of wood was located in the off cuts pile and offered up to the purlins and the point at which they touched the batten marked with a pencil. A recess was then cut into each end of the baton so that the purlins will fit into these recesses which will prevent the batten from moving sideways.

Here is the result complete with 11mm hole in the centre.

A different view showing how the recesses are angles to the same angle as the bottom of the purlins.

For now, I need two of these to put in place as soon as the capping is in place and the remainder can be added later.

I made the two needed battens from a thicker piece of timber as there will be a fair amount of stress on the batten as the nut is tightened up.

Here is a shot of the workshop roof taken with a drone before the capping was put in place. As you can easily see, the existing "capping" consisting of a bitumastic sheeting just nailed and screwed place, is missing in many areas.

The capping is now in place. No photos of the lift as I was pulling on the rope to help keep the capping from swinging as it was lifted, but the capping went into place really easily. The crane driver/operator was very good. Jamie Nunn of JN Crane Hire is his name and I'll certainly use him again if I ever need a crane lift.

The photo above shows the gaps above the lathe and wood pile with the cap in place.

Here's another filled gap. The workshop is darker now as not so much light is getting in. That will change again when the roof is replaced since whilst we will use corrugated iron sheeting for most of the roof, there will be six perspex sheets put in to let in the daylight. But that's for next year.

Not so easy to see the capping from ground level...

..nor from the house, as the green roofing felt merges in with the grass in the field beyond.

The first clamp in place. I have six in total to put in but only four are accessible right now, the other two are over the workbench. Although the bench is on wheels, many things need to be moved from under it where they were put to stay dry, so I'll leave those two clamps until later.

One of the other installed clamps but from ground level this time.

[Edit] 2021.04.22

Here is another aerial photo of the workshop roof, this time with the capping in place.