Hi Dougster,
The width of the door opening for this shed is about 64". I hope this helps.

Yes, you can insulate this shed if you choose to. It is recommended to put up drywall then insulate behind the drywall. I hope this helps.

It is recommended to phone Handy Home Products customer service at 1(800) 221-1849 to troubleshoot. I hope this helps.

The type of wood for this shed is spruce pine fir. I hope this helps.

Yes, the floor is not very strong, though, and it's covered with particle board that flexes badly in some areas. A foundation of some type will provide greater strength and support. A link to the assembly instructions is included on the web page for this item and gives a schematic of the floor.

Six packages of 3-tab shingles

Beige

It depends on whether you use a foundation and what type you use. Assembly of the shed takes about a day to a day and a half. Finishing it inolves, roofing materials (felt and shingles), caulking and painting. Allow 2-3 days for assembly and finishing. Time estimates assume that you have all the tools you need, have some help available, and have some basic knowledge of and experience with construction. Although this shed comes with a floor, I would highly recommend a foundation for added strength and durability. Foundation times will vary greatly depending on what type of foundation you use.

The loft is 48” x 84” osb panel. It's weight capacity is 400 lbs evenly distributed across the loft or just over 14.25 lbs/sq. ft.

Please not that the loft is NOT RECOMMENDED for sleeping or human habitation.

Hope this helps.

The Montana is available only as an 8' x 10'. However, each Home Depot store offers a full line of Handy Home special order Sheds. A 14' x14' is not available in any style, but the Berkley and Sequoia styles are available in a wide array of sizes. Information sheets on all available sizes are located in the Handy Home Products displays located in the parking lot of most Home Depot stores.