Once you have worked out the lath (battens) spacing, roll out the breathable membrane over the rafters. I found by placing a lath horizontally temporally under the membrane allowed easier rolling. Try to keep the lower edge right up to the felt support trays. The first lath should be fixed so the tile sits halfway into the gutter. Sorry I do not have any photographs at this stage. I left the calculation of the lath spacing to my roofer which was here to help over the weekend. The membrane has a guide where to overlap to. Before the end of the day both sides were felted & Lathed. We moved the tiles onto the roof in piles of 4 which were evenly distributed over the roof to save time the next day.
It is vital to make a jig to allow you to keep the space between the laths uniform and to use a string line to get the battens straight as possible. The string line should be used every third lath just in case any have been fitting warped. Nail each lath at 2 rafter intervals using galvanised nails. If you go for the reccommended nails Marley advise they will split the laths, so we choose to go for slightly thinner ones.
Start at the end with full tiles and nail every tile on the first row. After the first row nail every tile on the third row. At this stage I found my roof was not perfectly square, so we had to check the verticals and try to place the tiles slightly apart approx 1mm towards the top to correct the sqaure.
I was suprised how quick the tiles go down.
The mistake I made was not having the hip rafter flush with the roof line. I didn’t want it exposed when plaster boarding. This had to be worked around as I later found.
Kept it square using a level. Not bad over a 10m stretch. As you can see put a bunch of nails every thirst tile so I would not forget to nail them down.
The day before I noticed how much light was blocked with the felt. So as usual I got three sky-lights to also fit in. Building regs state the each side of the sky-lights should have double rafters, I assume to add strength.They would have to be doiubled up, from underneath. You can see the the roofer got the sky-light placement perfect so no tile cutting was needed.
Sky-light with flashing in place.
Just about. I may need to add some strips of tiles or lead flashing if it leaks.
At this low pitch I soon released how important the angle is. The ends of the flashing were almost horizontal so I bent up the ends so any rain would not blow over in high winds.
Looks good! Massive roof area. All that weight. Walking on the roof did flex the rafters. Now I wish I had gone for thicker rafters, anyway the ones fitted building regs approved.
I’ll do the hips another day…. perhaps a dry hip system.