A month ago we had a hail storm. Not too bad as hail storms go, but bad enough. There wasn’t a lot of rain with it, – a pity.
A few weeks later we had a lot of rain in an hour. Quite a storm all told. We found to our surprise that we had a number of leaks appear in our old school classroom. We had to find buckets for the drips on the carpet, the computer table and other various places around the house. Having drips of water dropping onto the carpet in what is our lounge room, really concentrates your attention.
I’m fixing a hole where the rain gets in and stops my mind from wandering!
We don’t usually have leaks like this, so I had to investigate. However, I needed to wait for it to stop raining, then to stop blowing, waiting for a day when there was no gusty wind. I once went up on the roof on a windy day and the ladder blew away, leaving me stranded up there until Janine came looking for me, replaced the ladder and let me come down. She must love me!
I finally found a day that wasn’t too windy, glarey or wet and slippery. I got up onto the top roof of the old classroom of the school. I found that the hail storm had pummelled the 130 year old corrugated galvanised iron roofing. Where there was an over-lap of the old sheets the iron had rusted to a very thin state because of the condensation in the over-lap, creating a few quite large holes.
A hundred years ago, corrugated iron roofing could only be manufactured in short lengths, as it was rotary folded across the sheets to make the corrugations. This meant that to cover a long-span, a number of shorter sheets needed to be used and this required overlapping to stop leaks. All old iron roofs suffer from this same problem of rusting out on the overlaps. We are lucky to have a roof that has survived for so long without too much trouble. We live in quite a relatively dry environment with about 500mm of rain each year.
I worked across the roof systematically siliconing every split, crack and thin rusty patch. The overlaps needed special attention. In one place I had to cut a small piece of rustic, but structurally very sound, old roofing iron into a small square. I glued this patch over the worst section, that was too big to close with just silicon alone.
The big issue turned out to be the ridge capping. This is 130 year old lead! I wanted to replace it 35 years ago, when I was much younger, able-bodied and building the extensions on to the Old School Classroom. I didn’t want any lead on my roof. Unfortunately I struck one massive problem that stopped me in my tracks. The old lead was about 600 mm wide and the old wooden roofing battons were well spaced accordingly. Modern galvanised ridge capping is only about 460mm wide. Not wide enough to reach the old battons. This meant removing all the old sheets of iron and screwing on new battons, then replacing the roofing, then screwing down the new narrow ridge capping. A massive job. Not one that I could complete easily in a day.
Being basically lazy, I decided that I had enough to do with building the new extensions onto the Old School classroom to make it into a house, so I left the old flashing up there. It was just easier to ignore it and hope for the best. The old lead capping has developed cracks and splits here and there along its length over the years. I siliconed these splits and cracks 30 years ago, and 20 years ago and then 10 years ago, Now the cracks are just too big and too long for silicon.
Now my lead flashing chickens are coming home to roost. I will need to re-roof the whole school roof eventually. I hope that I can make it last long enough, so that it isn’t my job to do. I couldn’t do it by myself now. I’d need to employ someone to help me these days.
My creative solution was to lift the old lead flashing and slide in new sections of shiny galvanised ridge capping in underneath the old lead. Then I screwed the old lead down over the new galvanised ridge capping, through into the old galvanised roofing. A cunning plan!
From a distance, no-one can tell that I did anything at all. It looks exactly as it did before I fixed it, and that’s the way I like it.