Installing New Steel to Reinforce the rotten Wood
Since our last update there has been some significant progress although we are now in a bit of a hiatus. Due to illness etc. we are down to one builder on site the last couple of days. We have been blessed with some fantastic weather with Britain (but not Cornwall) officially making it to heat wave status. We had the hottest summer day since 1976 at 35.6°C – hot by British standards but places like Singapore get that temperature about 7 months a year.
First major issue was to do the preparation for the installation of the structural steel. Basically we are a listed building so we are obliged to keep a much old structure as possible. In our case we have to keep some old joists and an old beam. The beam is severely rotted and damaged by woodworm etc. So we have to fit steel beams either side of the main beam and bolt all of them together. The beam is approx. 300mm x 200mm, or at least it should be. In reality some of it is only 60% of that size. Surprisingly though the middle of the beam is still incredibly hard. It made it very difficult to drill a hole through the beam to fit large threaded rod between the steels.
So we lifted the steels up through the window.
We then had to clear the area where the steel was to be anchored and install a steel I beam lintel in the outer wall. The inner wall had to be hollowed out and a hard pocket installed to rest the steel on. To do this the ends of all the joists had to cut off. They were pretty rotten any way so it was a good move. But then as part of the LBC (Listed Building Consent) we had to retain the old joists and bolt a new one alongside each old one! This meant chiseling out a pocket in the inner beam as well.
Having done that the joists on the other side of the beam had to be cut and a steel place on the other side of the beam. Straight forward as we had already done it once. The difficulty was drilling a hole from one side of the beam through to the other side to tie the two steels and the wooden beam together. As the drill started in soft semi degraded wood and then hit rock hard oak in the middle it was kicked off of straight meaning it came out 10 – 20 mm off straight on the other side so it didn’t line up with the hole in the steel.
We had to put new joists alongside some every bent originals as you can see from the photo below. You can see also that some joists have been repaired up to 3 times before.
Then we discovered that there were issues on the wall side. A couple of joists were totally rotten so they had to be discarded.
The other issue was that some of the joists rested on a wooden lintel – which of course was rotten. With some well judged stone work we overcame the issues.
We are now ready to install floorboards in bedroom 2 and 3 but not bedroom 1 were we still have some steel work to install. Since we are an old listed building we have to try to install reclaimed floorboards. We have saved some but many of the floorboards removed were so rotten and riddled with wood worm that we had to burn them.
We also discovered that we have been very lucky not to have been burned down. There were numerous dead mice (desiccated) under the floor boards when we lifted the floor. We have now discovered that in a lot of places the mice had chewed the plastic insulation away and there were bare wires in several places.
Whilst this was going on the plumber arrived. He removed the old boiler (second-hand in 2014 and it was in excess of 20 years old), disconnected and drained the heating. A new element was installed in the hot water tank so we can be sure of hot water. We also removed several radiators.