Selective Demolition

RenovateDSM — Sun, 22 Jul 2007 21:59:58 -0700

This phase encompasses the removal of all existing building materials that you intend to replace or that block access to other components of the project. If you are altering the building’s structure, it will be necessary to construct temporary supports to prevent damage to the remaining structure. Consult a professional if you are unsure of which elements are structural and which may be safely removed. Selective demolition drawings are required as part of the construction documents you present when you get your permit.

Before demolition starts, you or your contractor will need to contract with a private "roll-off" dumpster service – most dumpster services rent their dumpsters at a specific weekly rate and add either a collection fee or a “per ton” fee for dumping. Purchase a tarp to cover the dumpster and prevent rainwater from soaking the materials, which will add significant weight.

Demolition is one area of skills that is easy to acquire and will help you to gain a better understanding of the way your house is built. However, some demolition activities may require special preparation to reduce potential danger:

Hazardous materials – It is important to have the building assessed for environmentally hazardous materials such as lead paint and asbestos. If these materials are found you may either have them professionally removed or “encapsulated”.
Structural walls and beams - Your architectural drawings will indicate which walls are load bearing. Do not attempt to remove walls or cut beams without professional advice and/or assistance. Be particularly careful working with any wall that runs perpendicular to the joists above.
Decks and porches - If you are removing a wood deck or porch, be very careful to prevent a collapse. Avoid standing on or under any destabilized structure as you are working.
Damaged floors and joists - Pay particular attention to the floor structure (subfloor and joists). Water and fire can compromise the floor's structural integrity, adding to the danger for an inexperienced worker.
Roof - The higher you are off the ground, the greater likelihood a fall will cause serious harm. Sloped roofs can be dangerous if shingles are in poor condition (slate roofs are even higher risk of failed connections and slippery situations). Leave the high-wire acts to the professionals.

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Selective Demolition