Project Dingle

Restoring an old cottage...

Category: insulation

Plastering and all that

On the first floor, we have the gable-end wall that we’ve posted about earlier in the blog. There were 8 big rectangular panels of soggy bricks in a very old oak frame.

We’ve kicked the bricks out, replaced them with lovely cork (which is light, breathable, renewable, insulating, and basically perfect for the job).

Externally that’s had a scratch coat put on it, but does ned a second coat of lime to add a bit more weatherproofing and make it look pretty.  While this was going on, Ken Milloy, our splendid heritage timber man from Ludlow replaced the rotten sole plate and added a couple of repairs to the frame. I’d link to his website, but he’s a bit oldschool for that.

plaster 1

Internally, it’s getting

a couple of layers of hemp lime (that’s lime plaster with chopped up hemp in it).

The hemp does good things ; it adds strength to the mix, just like adding fibres does. It also reduces the weight of the plaster, which is nice for both  the wall and the plasterer.

Yesterday we knocked up about 20kg of it, and I squashed it onto the wall.  Knocking up is the process of mixing the plaster to get energty into it, and it loosens up the mix and makes it easier to handle and spread around. We also added about a litre of water to it, to loosen it further, as it was pretty chewy and I couldn’t really spread it.

It’s unlikely that the finish will end up looking the same as the rest of the attic, so we’ll probably whitewash all the plasterwork to standardise the apearance internally.  Once the surface of the first layer was about where I wanted it to be – something between 3mm and 10mm, we pressed a mesh into it. The mesh adds further strength to the layer, and will hopefully prevent cracking later on.

It was fairly hard work – both the mixing and the applying, but the end result looks ok to me.

I find jobs like this look terrible when you’re doing them, you’re so up close and examining every aspect of what you’re doing. If you go away and look at it an hour later you suddenly realise it’s fine, and it actually looks good. Almost like someone who knows what they’re doing has done it.  Almost.

plaster2

Next weekend we’ll hopefully get a few more panels done, if my blisters have subsided by then..

All the materials for this wall have been supplied by Ty-Mawr Lime, who have been hugely generous with their time and advice.  If you’re thinking of doing something like this, I’d really reccommend talking to them.

A Big Big Hole…

And yea verily did the weather gods decide these two idiots had pushed their luck far enough…

Idiot on scaffold tower in snow. Other idiot taking photo.

Putting up a new wall panel in an actual blizzard

A mere 10 minutes before this, the sun was shining and we were cracking on. You can’t really tell from this photograph, but it was the beginnings of an actual blizzard. Then it matured into more of a blizzard. Then we decided to call it a day…

But what are we up to? Good question.

Over Christmas, we both got frustrated at the lack of progress we’d made, so we made a plan. A 12-week plan to replace all the wet brick panels in the gable end wall. We’re on schedule.

Joe did a lime-plastering course at Ty Mawr, and learned all manner of useful and interesting things – such as, we can replace the bricks with cork panels. Originally, it would have been wattle and daub, and elsewhere in the house there are still a couple of panels knocking around. We’ll leave them be. But this wall is not original infill and it’s soaking wet, and we’re freezing, so cork it is. It works well with lime, is eco-friend, and is super-easy to use – and fairly inexpensive.

At the moment, costs are at around £800, which is massively less expensive than getting actual grownups to do it for us. But where’s the fun in that?

Okay, so here’s what we did. This is week 2, we did the first panel a couple of weeks ago. Here’s our neat stack of materials – EcoCork insulation boards, big plastic washers to fix them to the frame, and various screws.

A massive pile of cork panels

A massive pile of cork panels

We chose cork because it’s natural and renewable (it’s extracted from the cork-oak tree every nine years). It’s breathable, chemical-free, no synthetic resins or carcinogens. It has a low thermal conductivity so it’s very energy efficient. When we put our hand on the new cork panel in the wall, and the other hand on the old brick and plaster panel, the difference in temperature is remarkable.

We also had bags of ADHERE Vit lime adhesive to stick the boards together. And lime plaster and sand for the scratch coat.

The chaps at Ty Mawr advised us to seal the gaps between the frame and the original timber, just to stop water getting between them and festering. To do that, we’ve used Orcon F sealant, which is eco-friendly and suitable for all the stuff we’re doing.

Before…

Inside of the gable end wall before renovations

It’s a bit of a mess…

The outside of the gable end wall, before renovations

It’s a bit soggy…

Note the terrifying and shaky aluminium tower of doom (Vicky’s Christmas present from Joe. Vicky does not have a massive life insurance policy) and the horrifying ladder of death.

We made a cup of tea, had a think, and decided we’d better get on with it. Only one way forwards: we had to knock a mahoosive hole in the side of the house. So we did. It was an alarming thing to do, just in case you’re wondering. Especially in January.

Alarmed face as we push the bricks out

The face says it all, really

Carefully knocking bricks out

Carefully knocking wet bricks out

Massive hole in wall

Not a window

That little blue blob to the right of Joe? That’s bubble wrap and foam packing, from where we accidentally knocked a little hole in the wall before Christmas. Why not start there? Good question. Because the timber horizontal above it needs replacing, and Ken’s not available just yet.

Next up: we took the top layers of woodwormy, rotten timber off the original frame, sanded it smooth, and brushed the dust off.

Original timber frame ready for sanding

Sanding the top layer off

Then we fitted a timber batten frame inside the original oak frame, screwing the battens in.

Fixing a timber batten frame

Fixing a timber batten frame

And finally sealed the gaps between the new batten frame and the original oak.

Frame sealed and ready for cork

Frame sealed and ready for cork

Then we fitted the cork boards onto the frame. This is a 20mm thick board, fitted inside the batten frame and screwed onto it.

Cork board screwed into frame

First layer of cork goes on

New cork wall panel

New wall panel!

It fits neatly inside the timber frame, with a few millimetres all around for the lime plaster to push into.

Joe on the tower outside the house

Ready for the next layer

Vicky up a tower putting cork adhesiveon

Slapping the cork adhesive on

The next layer goes on outside – another 20mm thick board. We fix it using the cork-lime adhesive, which we mix in a big bucket, and apply like lime plaster.

Then another layer goes on top of that – a 40mm thick board.

So all in all, the new cork wall panel is 80mm thick. We’ll be lime plastering over the top of that.

The first coat is just a scratch coat of lime, because we’ll be sandblasting the external timbers and the stone wall in the summer. Then the final coats of lime plaster and limewash will go on later this year.

Newly plastered wall panel

Newly plastered wall panel

We’ll no longer need that lead flashing, because it’ll all be watertight. No more water pouring down the walls…

The second panel was a little tricker, as you can see…

Not a square frame

Not a square frame

Joe's amazing frame bodge from one of our new oak offcuts

Joe’s amazing frame bodge from one of our new oak offcuts

Apart from the blizzard, it’s been an epic couple of weekends. We’ve made great progress and we’re having tons of fun :)

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