18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
- Product Code: A1-7030
- Delivery Time: 2 - 4 weeks
- Brand: Steico
- Model: 1220mm x 575mm - 168m2
- Weight: 181.44kg
Our ratings on 08-10-2026:
4.8 out of 5
18mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 240
Length: 1220mm
Width: 575mm
Thickness: 18mm
Single Coverage: 0.7m2
Pallet Coverage: 168m2
Density: 60kg/m3
Weight/m2: 1.08kg
Weight: 181.44kg
Thermal Conductivity: 0.036W/mK
R-Value: 0.5m2K/W
18mm STEICOflex 036 Inserts are designed to fill the "C" shaped void on either side of an I-joist web. By installing these inserts, you transform the irregular I-shape of the joist into a solid rectangular cross-section. This makes the subsequent installation of the main insulation layer much faster and more effective. STEICO flex 036 (Inserts for I-Joists)—also known as web insulation—is a specialized version of the flexible wood-fibre batt. While standard batts are thick for filling rafter voids, these inserts are thin, high-density strips designed specifically to fit into the recess of an I-joist web.
CHARCTERISTICS
- The primary purpose of these inserts is to flush out the joist. This ensures that the main insulation (whether batts or blown-in STEICOzell) can be installed tightly against a flat surface, eliminating the air pockets that usually occur in the web area.
- These inserts come in specific thicknesses tailored to match the flange width of the joist:
- 18 mm inserts are used for joists with a 45 mm flange.
- 25 mm inserts are used for joists with a 60 mm flange.
- Despite being thin, the material is robust and has enough spring to be friction-fitted into the web recess on-site, staying in place without the need for mechanical fixings in most cases.
- By filling the web void with wood fibre, you further reduce the already low thermal bridging of the I-joist, improving the overall U-value of the floor or roof.
- Filling the drum-like voids in the joists helps dampen sound transmission through floor and ceiling structures.
APPLICATION
- Prefabricated Elements: Often factory-fitted by timber frame manufacturers to create a solid feeling joist that is easier to insulate later.
- On-Site Upgrading: Installed by contractors before blowing in loose-fill insulation to ensure a perfect, void-free fill.
- Airtightness Detailing: Provides a flat surface at the ends of joists, making it much easier to tape membranes around the structural members.
CERTIFICATIONS
STEICO_Flex_Technical_Data_Sheet.pdf
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