Floors

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Floors and Floor Framing
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Floor Framing

• A structure placed on top of the foundation that
  serves as a building platform.
• Begins once the foundation is complete.
• Usually happens before the foundation is back
  filled.
• Floor framing helps the foundation withstand the
  pressure the ground pushes on it.

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Girders and Beams

• They provided the needed support when the span is
  to great to go from foundation to foundation.
• Can be wood, metal, or engineered lumber.

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• htp//mywebpages.comcast.net/nohfh/images/House1/G
  irder.jpg

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Sill Plate or Mud Sill

• What are they?
• Is there a difference?
• What do they do?
• What are common problems?
• How are the problems fixed?

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Sill, What is it?

• They are placed directly on top of the
  foundation. A seal is placed between them and
  the foundation. They give a nailing surface for
  the future structure
• They are attached using bolts or straps.
• A sill plate and a mud sill are one in the same.
  Mud sill is an older term. A bed of mortar was
  placed on the foundation and the sill was placed
  in it.

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What are common problems?

• Moisture and termites are big problems.
• Both problems can be addressed by using
  chemically treated lumber.
• Placing metal shields between the lumber and the
  foundation can protect the sill.
• Raising the foundation above the ground higher
  can help avoid the two main problems.

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CAN YOU IDENTIFY THESE PARTS?
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Parts of a Floor System
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Joists

• Carry the weight of the floor structure and
  contents between girders and sills
• Usually placed on 16 inch centers
• Joists are attached to header boards. Header
  boards are capped by stringer boards

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Bridging Joists
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Subfloor

• Ties the joists together and creates a base for
  the flooring.
• Nailing pattern every 6 on side and 10 along
  joists
• In most cases it is glued along the joists. This
  creates a seal and helps eliminate squeaks.

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Engineered Materials
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Terms to know

• Joist 2x8,10 or 12
• Header
• Blocking (x or solid) only on dimensional lumber
• Trimmer joists
• Tail joists
• Subfloor (3/4 tg OSB)
• Mudsill
• Rim joist
• Platform vs. balloon framing
• Joist hangers
• Girders and beams