Posted by Manuel Oliveros on October 18, 2002 at 09:21:33:
In Reply to: Re: Structural Insulated Panels - SIPs - elec and plumbing posted by JWmHarmon on October 17, 2002 at 21:44:53:
Plastic means that the froduct flows. For a core of plastic foam this means that the core wll creep taking the deformation flexure causes in the panel. Obviously one may expect initial deflections in accord with the initial composite section, or two boards at some distance. On the long term however, plastic flow of the core may turn so big for panels solicited in flexure that counting much on the connection between the boards to keep far bigger inertia than that of the loaded side of the panel maybe wishful thinking. In short, one should expect that creep along time will be also big for panels in flexure, this affecting both to strength and deflections. However the panels should retain noticeable improvement in the deflection respect that of a single board, due to the physical arrangement.
The less considerate providers will have estimated the inertia only to cover good behaviour for some period of liability, say 10 years. Others might give the designer insight on how much strength and inertia you should expect for the lifetime of the product, by some formula or chart.
Respect the stability of expanded polyestirene I would say it is good when not exposed to light (nor scorching heat, under which it will age quickly). However it is attested mice and rats love to cut holes through it, so if rodents are a problem in your area maybe this material is not the ideal one.
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