I think a sand/cement "grout" might be OK but messy / fiddly. I don't
think vibration would compact sand sufficiently to prevent a small sag.
I'd be inclined to look at the chromed steel tubing which is sold for
wardrobe rails which I'm sure is going to be significantly stiffer. IIRC
usual diameter is about 20 mm. Plenty in Screwfix, both round and oval.
Yebbut, that's unconstrained cement. In a tube, where it's
constrained, it will behave differently, although IANA civil engineer
so can't say how in detail. But if you try and bend an open copper
pipe, at some stage it will kink and flatten. Concrete inside it will
stop that. Anyway, I was looking for stiffness not strength as such.
The stiffness of the pipe depends on:
1. The diameter - the bigger the better.
2. The thickness of the walls of the pipe - the thicker the better.
3. The material. Steel is much stronger than copper.
Perhaps you could use some old gas barrel?
Otherwise, could you support it at various points along the length, so
it doesn't need to be as strong?
<snip> >*it's a length I have spare, but I could get some 22mm pipe if it
I think the key here is having a good vertical section. Flat strip
would be good but would flop sideways so you also need some horizontal
section to manage that.
So, a light rectangular box section steel or if you can get some 22mm
copper in there, what about two lengths of 15mm solder tacked (taped
for testing) together and used 'over and under' / Fo8?
Cheers, T i m
Yup I see what you mean, that has quite an impact!
Steel conduit would certainly be an option. You may also be able to get
a length of oval or round wardrobe hanging rail. They may be stiff enough.
However one option would be to arrange the wall mounting so that you can
put the pipe under tension. It ought to be possible to fashion a couple
of attractive wood mounts with holes for the pipe to pass through (and
that you can cross drill to allow a screw to intersect with the pipe to
retain it), then a moveable part of one or both mounts, screwed
laterally to a fixed bit so you can tighten the screw and pull it taught.
Another option would be self adhesive velcro strip. Fix a wood batten to
the wall with "hook" bit of the strip fixed to it, and then place the
fluffy bit on the back of the cloth. You can then stick it in place. (a
few stitches on the cloth may be wise)
(you could even do a full frame like that, so that its supported at the
sides and bottom also, and which could then be "hung" like a picture)
I'd advise against (bare) copper. It will react with humidity in the air
perhaps the chemicals in the dyes in the fabric- possibly damaging your
(I speak from experience, although not with copper pipe. Around the time
we met (some 40+ years ago) my wife did a very intricate embroider
picture. It hung for years in our bedroom. It had been framed- we bought
the frame and I think she did it framed it herself. Over the years, the
chemicals from the backing board stained the background. We've later
learned there are techniques to prevent this- several but that is not
You could cover the pipe in plastic sleeve, the kind used to cover
wires, it is cheap and available in various sizes. Heat shrink would be
good but expensive for that much.
I'd be equally wary of galvanized or bare steel.
To stop/reduce bending, a bit of dole, covered in epoxy, and forced in
would probably do the job.
However, I'd use either a chrome tube for a wardrobe rail- if it will
fit. These a rigid.
OR a length of 15mm stainless pipe. That will also be rigid.
Neither are likely to react with moisture and/or chemicals in the dye.
Slide another pipe inside of it - B&Q have tube in ali and steel in a
variety of sizes - it need not be a perfect fit.
Or dry sand and some repair/casting resin soaked into the sand (Halfords
may still sell this for use with fiberglass)
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