Using Chimney To Support Roof Deck

This is where a high pitched roof is necessary.

Using chimney to support roof deck.

It is placed in between a couple of bricks and bends to lay on a section of. For deck roof posts dig holes for the roof posts and pour cement to keep them secure. You may be able to buy a pre made cap at a heating supply retailer if you have a standard size clay liner that protrudes above the top of the chimney. 2 fix these support posts to your decks original support frame bolts work well.

Counterflashing and base pieces overlap but aren t physically joined so they can move independently yet still repel water. A great deal depends on the pitch of the roof. The chimney structure comes through the roof leaving a large gap between the. Flashing is typically made from lead but can also be aluminum steel or copper.

Use along with storm collar to weather proof the chimney penetration through the roof deck designed with a large base for extended protection for use on roof with a pitch between 0 12 and 6 12. Place pier blocks so that the posts will be against the inside of the support frame. The upper pieces of counterflashing are usually tucked into chimney mortar joints and made to overhang various pieces of base flashing which are nailed to the roof deck. If you like the idea of having the roof above your house s roof you need to make sure the support posts are within 4 feet or so of the original gutter on that side.

Chimney material and the roof deck. Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons. 20 6x6 pt posts would be long enough to use as both deck support and roof support but the expense isn t justified because all that is needed to support the roof would be 4x4s. In roof supported metal chimney installations in mobile home chimney installations and in cathedral ceiling installations of metal chimneys a ceiling support box or special roof support is required.

For that reason installing a galvanized or painted steel chimney cap is the most common option. Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. If the deck doubles as a porch it needs to be able to support no more than 80 psf. I have a client who wants a deck built approximately 10 off the ground with a roof.

A higher pitched roof would be better for extra living space than a lower pitched roof. The other is just used to support the trusses. Flashing keeps the water from entering that space and must be fully sealed.