Do these sheds have anchors that will allow mounting on a concrete foundation?

You can buy anchors for mounting on concrete.

Regarding your Lifetime brand 11 x 11 sheds, how do they hold up to extreme heat? Do they warp at over 100 degrees?

These sheds are known to do quite well in high heat situations and are not known for warping.

Do you know of any plastic 4' wide shed that can allow a front and back entry?

We do not offer such a configuration. We apologize.

On Duramax Woodbridge 10.5 x 13, how thick are the wall panels?

The panels are approximately 1.25" thick.

How do they hold up in cold weather and snow?

Snow and wind ratings are available for many of our units, it would just depend on which one specifically you were inquiring about. In general plastic, sheds hold up well.

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