What NOT to do to a timber frame

Documents severe timber frame deterioration associated with impermeable repair materials, sealants and coatings on an old building.

Independent guidance from Heritage House 2 min read

Badly decayed timber exposed during repairs

This is probably one of the worst timber frames I’ve seen for a long time. Quite how it got to be SO bad, I have no idea. I think it’s the people maintaining it – lack of understanding about breathability. They didn’t WANT to hurt the building. I also know that during restoration in the 1970’s, there was a total lack of ANY traditional material in the specification – I’ve seen it.

The entire front frame was ready to collapse, and the gable wasn’t far behind.

The current owners have inherited a lot of problems and are doing their best to sort out what is basically a rebuild, on a very limited budget.

So what caused total destruction of a VERY important public building?

  • Very poor specification by architect
  • No understanding of traditional building by contractors
  • Cement
  • Silicone sealants
  • Expanding foam
  • Cement
  • Resin wood filler
  • Plastic paint
  • Acrylic sealants
  • Gypsum plaster

The Sill Beam

This is the sill beam to the upper section. It is rotten, to the core. The bit in the middle is the original 17th C beam. Running vertically off it are the posts – some original, and some replacements. They have rotted off, so the tenons are gone. In the foreground is lead – which has been nailed to the beam. Water was trapped on the lead, rotting it from underneath and behind.

In front, is a modern piece of planking. Why it is there,I have no idea – It should never have been put there. It’s rotten.

The posts are filled with a variety of things – from dark brown resin, to cement, gypsum, expanding foam. Bits of brick, plywood – anything that happened to be there was thrown in the hole and gooped around to make it fit.

The infills – same thing – brick, laid in cement – so a ticking time bomb from day one – and filled around the edges with silicone, acrylic, resin and foam. The poor posts had no chance – they just rotted where they stood.

The entire front elevation is ready to collapse – everything has rotted.

Fungus Galore…

The rest of the front elevation is similar – fungus everywhere.

And more fungus