Thermowood or Western red cedar?

[devonuk]

As heading - I want to buy a 8x14 wooden greenhouse, and these are the 2 types of wood on offer. Any views on which is superior?

[johnjohn]

On this chart thermowood is indicated as being durable with a life expectancy of 15-25 years. Western Red Cedar appears in both the durable category and the moderately durable, 10-15 years, so I suppose it depends upon the quality of the Cedar? If that is an unknown then the thermowood might be the best one but I've no personal experience.
http://www.woodworkersuk.co.uk/image...lity-chart.jpg

[devonuk]

On this chart thermowood is indicated as being durable with a life expectancy of 15-25 years. Western Red Cedar appears in both the durable category and the moderately durable, 10-15 years, so I suppose it depends upon the quality of the Cedar? If that is an unknown then the thermowood might be the best one but I've no personal experience.
http://www.woodworkersuk.co.uk/image...lity-chart.jpg

Thanks for the link. I note that Accoya treatment puts radiata pine into the very durable class - thermowood treatment of the same wood only gets you durable. I imagine accoya is priced accordingly...

[mrsbusy]

I would go for whichever is cheaper. My back garden green house is thermowood - in 15 years I will be able to give an opinion! I have had it 3 years - the wood had got quite black where it gets damp in the winter but otherwise it is ok. The wasps still like it and chew the top layer of cells off same as always.