To some extent but it depends on the timber type, structure type and the treatments applied to the timbers.
So as long as you ensure your materials are correct for the intended application you will be fine.
For example there are 12 strength in timber grades in the BS 5638, C16 and C24 standards are by far the most common. C16 CLS is fine for interior framing, however on this application I used C24.
C24 timber is most commonly used for external construction projects like barns / decking and shed bases.
All the frame was then treated and sealed with a 2 top coats of waterproofer and preserver. This was done before closing in, sheeting and cladding.
Also as this is an open contruction, it will have plenty of ventilation and no heat / moisture source and temperature variation in relation to the ambient, so again well within tolerance. Stick frame and roof was up around Jan, not sheeted in and tiled until end of summer and it was very hot last year, so its well settled now, no cracks and no noises.
All expansion and contraction is related moisture content in the wood, the tighter the grain the less water can be retained, add to that pressure treating with chems that effectivly boil off the water content, then the permiable top coat wrap you minimise this.
It will move, but overall not enough to cause any concern, in actual fact the strongest part of the structure is the OSB.....
well done, looks awesome. V v v jealous!
