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My original concept of using "Onduline" as an exterior cladding is now gone. http://www.onduline.co.nz/
Onduline, after much investigation and gnashing of teeth is too soft to act as a good exterior cladding: it punctures easily, and is tricky to join when installed horizontally, as we would wish to.
Anyway, I have come full circle - now the idea is to more closely match Frank's original look of Board and Batten. Actual Board and Batten is prohibitively expensive, and is thus out of the question.
We will now use: BGX
BGX is a marine-qualified wood ply product, with a rough-sawn pinus radiata finish.
It accepts stain, paint or sealant just like raw timber.
It comes in panels 2.8 x 1.2 metres in size, and we will install it horizontally, with "inter-floor" powder-coated flashings (of undecided colour) to match every 6th concrete block (20cm unit) join...
Subsequent to completion, I will install, with builders glue, the same powder-coated flashing strip, at 40cm intervals to break each panel into 3 horizontal strips of 40cm each - close to the 13" unit FLW worked with in the original Usonians.
Anyway - what recommendations do readers have for treating the rough wood finish?
I think I am inclined to do absolutely nothing to it, and simply leave it to go grey/silver as time and weather change it.
What do you think?
*Plotting to take over the world since 1965
Try hardiplank. I wanted a "jacobs look" for my house and this succeded handily, and affordably. It is very low maintenance, and you can paint it any color you want.
Email me at email@example.com and I will send you some pictures.
By the way, I used marine grade plywood on 3 garage doors and it is holding up very well after 5 years with a Sikkens finish. This may be different from the BGX. I remember that sheets of plywood had Made in France markings though. These doors get direct sunlight.
It is resin impregnated with a wood veneer surface. It does require ventilation, but it is available in various finishes and is maintenance free. May not be applicable to your use, but worth a look.