I-Joists

LP® SolidStart® I-Joists are lightweight, straighter and more uniform in strength, stiffness and size than traditional lumber. They also offer wide flanges for greater stability.

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LP SolidStart I-Joist Benefits

LP® SolidStart® I-Joists are more versatile than open web floor trusses, and more uniform and dimensionally stable than lumber. They can be trimmed on-site, and long lengths allow ceilings and floors to be designed with fewer pieces, saving installation time. Build sturdy, stable floors with wider flanges. Benefits include:

  • Quick Installation: Weighs less than traditional lumber.
  • Cost-Effectiveness: Long lengths allow ceilings and floors to be designed with fewer pieces.
  • Peace of Mind: Less likely to split, shrink, twist, warp or bow.
  • Durable Design: Larger nailing area and increased stability.
  • Sustainability: Wood sourced through programs certified under the Sustainable Forestry Initiative®.
  • Lifetime Limited Warranty: Extensive product line backed by warranties you won’t find with traditional lumber. See complete warranty details for more information.

How It’s Made

LP® SolidStart® I-Joists feature an advanced design and tough build for superior performance:

  • Combines laminated veneer lumber (LVL) or finger-jointed sawn wood flanges with a web of oriented strand board (OSB) to produce an I-shaped structural member.
  • Both materials work together to resist deflection, bending stresses and shear.
  • LVL and MSR lumber flanges up to 3-1/2˝ wide for greater stability.

Product Specifications

Region Series Flange Width Flange Material Depths
East LPI 18 2-1/2˝ Solid Sawn 11-7/8˝
East LPI 20Plus 2-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝, 14˝, 16˝
East LPI 32Plus 2-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝, 14˝, 16˝
East LPI 42Plus 3-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝, 14˝, 16˝, 18˝, 20˝, 24˝
East LPI 52Plus 3-1/2˝ Solid Sawn 11-7/8˝, 14˝, 16˝
East LPI 56 3-1/2˝ LVL 11-7/8˝, 14˝, 16˝, 18˝, 24˝
West LPI 18 2-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝
West LPI 20Plus 2-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝, 14˝, 16˝
West LPI 32Plus 2-1/2˝ Solid Sawn 9-1/2˝, 11-7/8˝, 14˝, 16˝
West LPI 36 2-1/4˝ LVL 11-7/8˝, 14˝, 16˝, 18˝
West LPI 42Plus 3-1/2˝ Solid Sawn 11-7/8˝, 14˝, 16˝, 18˝, 20˝, 24˝
West LPI 56 3-1/2˝ LVL 11-7/8˝, 14˝, 16˝, 18˝
  • Available with solid sawn lumber or LVL flanges
  • Flanges on LP SolidStart I-Joists are wider than typical flanges
  • All solid sawn flanges are individually tension proof loaded after finger jointing
  • Suitable for a variety of applications, including floor and roof framing
  • Can be cantilevered to accommodate various floor framing details
  • Can be used as roof rafters; ideal for cathedral ceiling

Product Videos

LP SolidStart LPI 450 and 530 I-Joists at IBS 2014

LP at the 2014 International Builders’ Show.

LP SolidStart I-Joists Product Video

Learn why LP SolidStart I-Joists are the right choice.