Sorry, I'm no structural engineer but I do know what a tenon is and
that's not what you're showing us. What you have is a single heavy beam
and many more joists which are all "butt joined" to their headers.
See the definition here
<http://en.wikipedia.org/wiki/Butt_joint>
and in particular scroll down to "light frame building construction".
This is a tenon which fits into a mortise or mortice
<http://en.wikipedia.org/wiki/Tenon>
Your butt joined joists are probably just nailed in endwise through the
header where the outside of the header is accessible or "toe-nailed"
otherwise. If this was current US construction the joist would likely
be installed with joist hangers which makes for a more easily built and
stronger joint:
<http://hardware.hardwarestore.com/27-110-joist-hangers.aspx>
These photos illustrate "post and beam" construction using mortise and
tenon joinery with no nails. Frequently still used in barn construction
around here but not so often in houses anymore except very expensive
ones. <http://www.mainebarncompany.com/photo-gallery.asp>
Chuck Norcutt
swisspace wrote:
> I have been busy with the renovations and extension at the house but
> still following the list, but have not bothered to see why my post about
> E-3 raw in aperture and my theory on the tilted sensor issue post went
> missing - anyway totally of topic but I know how the list enjoys such
> things and is full of experts ;-)
>
> They have now fitted the roof to our extension, it is a substantial
> construction of thick wooden beams - I haven't measure them yet but I am
> guessing 25cm (12") thick however what puzzles me is the puny joint they
> have made (tenon if I remember correctly) see here
>
> http://thattimeoflife.smugmug.com/gallery/613944#271142318
>
> it is maybe 5cm or two inches thick - I am not an expert and I am sure
> the shear strength is enough but if I had done it I would have made the
> joint 50/50
> here are some pictures from a wider angle
>
> http://thattimeoflife.smugmug.com/gallery/613944#271142465
> and even wider
> http://thattimeoflife.smugmug.com/gallery/613944#271142622
>
> and a view from above (excuse the distortion it was at 7mm end
> http://thattimeoflife.smugmug.com/gallery/613944_WsNbX#271142813
>
> the plywood boards they put on top were about an inch (25mm) thick and
> will spread the load but somehow to me it seems either the beams are to
> thick or the joints to thin
>
> am I wrong
>
>
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