25mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 184
25mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 184
- Product Code: A1-7031
- Delivery Time: 2 - 4 weeks
- Brand: Steico
- Model: 1220mm x 575mm - 128.80m2
- Weight: 181.44kg
Our ratings on 13-05-2026:
4.8 out of 5
25mm STEICOflex 036 I-Joist Web Inserts - 1220mm x 575mm - Pallet of 184
Length: 1220mm
Width: 575mm
Thickness: 25mm
Single Coverage: 0.7m2
Pallet Coverage: 128.8m2
Density: 60kg/m3
Weight/m2: 1.5kg
Weight: 181.44kg
Thermal Conductivity: 0.036W/mK
R-Value: 0.7m2K/W
25mm 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
Brand: Steico
Model: 60mm x 40m roll
Delivery Time: 2 - 4 weeks
STEICOmulti Tape P is a robust, single-sided adhesive tape with a special kraft paper carrier. It is specifically designed for the permanent and airtight sealing of membrane overlaps and board joints within the internal building envelope. STEICOmulti tape P is the standard high-performance adhesive ..
Brand: Steico
Model: 1880mm x 600mm - 63.28m2
Delivery Time: 2 - 4 weeks
40mm STEICO Safe is a multi-functional, rigid wood-fibre insulation board designed for roofs with increased rain protection requirements. It is the only board in the range that can be used on low-pitch roofs (as low as 5°) without the need for an additional full-surface roofing felt or membrane, tha..
Brand: Steico
Model: 1350mm x 600mm - 22.68m2
Delivery Time: 2 - 4 weeks
100mm STEICOtherm Dry is a multi-purpose, rigid wood-fibre insulation slab. Because of its manufacturing process, it is significantly lighter than the "Wet" version, making it the preferred choice for large-scale roof and wall applications where reducing the structural load is key. the STEICOtherm D..
Brand: Steico
Model: 1190mm x 575mm - 6.16m2
Delivery Time: 2 - 4 days
50mm STEICOflex 036 is a flexible, high‑performance wood‑fibre insulation slab designed for exceptional thermal comfort, acoustic absorption and healthy building performance. Made from sustainably sourced wood and certified to rigorous European standards, it offers one of the best thermal conductivi..
Brand: Steico
Model: 1190mm x 575mm - 13.60m2
Delivery Time: 2 - 4 weeks
240mm STEICOflex 036 is a flexible, high‑performance wood‑fibre insulation slab designed for exceptional thermal comfort, acoustic absorption and healthy building performance. Made from sustainably sourced wood and certified to rigorous European standards, it offers one of the best thermal conductiv..
Brand: Steico
Model: 1350mm x 200mm
Delivery Time: 2 - 4 weeks
25mm STEICO Fix is a high-density, wedge-shaped insulation profile designed to sit directly beneath external window sills. Its primary function is to provide a thermally efficient, waterproof safety layer that directs any moisture or driving rain away from the structure and back to the outside of th..