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Archive for February, 2013

Pegs or ‘tree nails’

Timber frame musings – ‘The Jowl Post’
PEGS
Pegs or “tree nails” are used to hold joints together, locking the tenon into the mortice. They are hand made from straight grained offcuts of green oak.

Step 1 – Using a huge amount of brute force and a modicum of skill, cleave the oak along the grain into square blanks with mallet and froe.

Step 2 – The blanks are then bashed through a hexagonal die with yet more brawn and even less dexterity

Step 3 – Apply a gentle taper to the pegs with a drawknife and shave horse.

Step 4 – Leave to dry for a couple of weeks

Feb-28-13 a las 12:17 pm Jowl Post, Uncategorized. Sin Comentarios

Scarfed Joint

Friday afternoon musings about timber framing – ‘The Jowl Post’

The Scarfed Joint

Timbers can only be as long as the tree they are cut from and often that isn’t long enough to provide a continuous wallplate, soleplate or purlin running the length of a building.

Cue the nifty and ostentatious “scarfed” joint which aims to join lengths of timber to effectively create one very long timber.

Scarfed joints give the timber framer the opportunity to show off his virtuosity and attract a mate by inventing ever more complicated forms – bridled, edge-halved, lightening, stop-splayed and tabled, undersquinted with abutments………..it worked for me!

 

 

 

Feb-15-13 a las 10:16 am Jowl Post. Sin Comentarios

‘Joists

Friday afternoon musings about timber framing – ‘The Jowl Post’
Joists
These are the horizontal timbers at first floor level whose job is to support the floorboards. Standard softwood joists which are deep and narrow tend to be concealed from below with plasterboard. Oak joists however are traditionally wider than they are deep, and left exposed – it would be a crime to cover them up! The timber frame equivalent of a six pack – if you had one, you’d want to show it off. As the crossframes go up the joists can be dropped into simple housings or dovetailed housings. Where joists are jointed with soffit tenons then the crossframes need to be spread to receive the tenons – an altogether trickier operation but immensely strong as they can be pegged.
Feb-12-13 a las 2:02 pm Jowl Post. Sin Comentarios

Mortice and Tenon joint

Friday afternoon musings – ‘The Jowl Post’
Mortice and Tenon joint – this is the most common joint in timber framing.
In it’s crudest form, the mortice is a slot cut in one timber while the tenon is a tongue cut in another. The important bit is to design the joint well, so neither element weakens the other – it’s all about balance, harmony, zen and the art of timber framing! The assembled joint is held together with a hand made oak peg and will last for hundreds of years.
Feb-12-13 a las 1:54 pm Jowl Post. Sin Comentarios

English Tying Joint

Friday afternoon musings – ‘The Jowl Post’

English Tying Joint – the most important joint in timber framing.

Ingenious joint in use since medieval times – Ties together the jowl post, the wallplate and tie beam. Jowl Posts are the main posts in a timber frame that support the wallplate and the truss. The post is “flared” at the top where it intersects with the wallplate and the tie beam. This is so it can be tenoned into the tie beam (“Teazle tenon”) and the wallplate. The jowl post is commonly cut from the base of the tree to make use of the natural grain of the wood. Think of it as a tree turned upside down with it’s wider base in the air.  Jowls can be shaped in curves or gunstocks. The jowl post is tenoned into both the tie beam and the wallplate, and then the tie beam is secretly dovetailed over the wallplate to stop outward thrust of the roof.  No one can see it but we know it’s there, so we can sleep safe at night in the knowledge that our house won’t fall apart!

Feb-12-13 a las 1:49 pm Jowl Post. Sin Comentarios
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