Expansion

....... or your "trundleduct" now has a bow !

Chris

On Mon, 6 Apr 2009 13:04:28 -0700 (PDT), snipped-for-privacy@o2.co.uk said in :

It's the building, I reckon. The lift bridge is also short by the same amount. Incredible.

Guy

If the structure is less than say 15 years old and you have a long run of brickwork with no expansion joints then you may be right.

Private garages are a prime example as the bricks are left exposed to the elements ( normally ) than the rest of the building and are mostly single skin.

Chris

On Mon, 6 Apr 2009 14:17:58 -0700 (PDT), snipped-for-privacy@o2.co.uk said in :

Yup. It's an outbuilding, single skin and dry lined, 27' long. I'll have to work out some way of adjusting for it I guess. The expansion joints in the rails are doing the job elsewhere, luckily.

Guy

No fixing to the walls perhaps?

"Just zis Guy, you know?" wrote

The room on second floor of the Victorian property in which my shop is housed and where I used to have my model railway, would vary by approximately a quarter of an inch over its twenty foot length depending upon the time of year.

John.

That's interesting. It's roughly a tenth of a percent. It's too little for cross grain wood expansion and too much for wood expansion with the grain. Both are humidity related. I wonder if what you're seeing could be temperature related?

"Larry Blanchard" wrote

Shallow foundations on clay might be a factor too. We have relatively low humidity here in the UK, so am guessing it's temperature related.

John.

Exactly. In a a maritime climate, close to the North Sea and a major river?

Relatively low humidity??? John, I wonder what you think is high humidity... ;-)

wolf k (writing from a place where we think 60% is too high)

I chuckled at that as well. Here in the inland northwest of the US, our humidity in summer is often in the 10-20 percent range. All our precip is in the winter and much of it is white :-).

But if John's humidity is fairly constant, it doesn't matter what it is.

"Wolf K" wrote

Well we never sweat here, that's pretty much for sure! LOL.

John.

Guy

I you do intend to 'fix' the problem keep your 'fix' flexible.

If the expansion has only been noticed in the past few weeks then several factors may be involved.

Chris

But John ..... Mr Brown says we have to pay for global warming. No scientist can EVER go back on this as we are now paying tax for it.

Chris