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Building code allows 24-inch on-center spacing for roof trusses. However, you can install them on 12- or 16-inch centers to handle large loads or other exceptional circumstances. In cases such as covering a wide span or supporting alternative roofing materials, where a structural engineer needs to evaluate or create a design for your trusses, the plans will indicate the spacing. 

EPDM roofing is a single-ply roofing material made of rubber, and a professional will install it in a single sheet and seal the seams. Built-up roofing (BUR) consists of multiple layers made from asphalt, adhesives, and roofing felt. A professional will construct the layers of BUR on-site. EPDM is easier to repair and has better resistance to extreme temperatures, while BUR is more fire-resistant and affordable.

Yes, you should seal and cap an unused chimney to protect it from damage. Sealing the structure helps prevent moisture damage, which can lead to issues like cracks, spalling, efflorescence, and damaged mortar joints. Capping the chimney is also crucial to prevent blockages, damage from invasive critters, and downdrafts, while still allowing for proper air ventilation to manage moisture. For the best results, consult a chimney professional to select the right type of chimney or flue cap for your home. It's also wise to continue with annual chimney inspections to maintain the structure's integrity.

Chimney caps have a solid top but perforated sides so smoke can exit safely. If rain or snow falls downward, chimney caps can protect the chimney’s interior. Just note that if rain or snow blows in sideways, there’s a higher likelihood it will enter the chimney—but it's not often a cause for concern as long as you have a cap.