F1 Composite supplies pultruded fiberglass door thresholds and GRP sill profiles for door fabricators and system developers. The composite section forms the base of the opening, with geometry developed around the frame, seals, drainage and floor connection.
Continuous glass reinforcement and resin form a constant-section sill profile. Hollow chambers, support webs and mating features can be developed around the opening rather than selected as an unrelated trim piece.
Explore custom profile development
A narrow raised deck above two hollow chambers, with a continuous closed base.
A narrow raised deck with a shallow lower chamber and an open hooked edge.
A wider raised deck with longitudinal ribs, a stepped chamber and a closed base.
A wider ribbed deck and stepped chamber, with a continuous open hooked edge.
Illustrative section options. Seals, end blocks and other assembly components are specified separately.
Develop the threshold around inward- or outward-opening leaves. Align the seal contact, jamb connections and exterior drainage with the frame section and finished floor levels.
Opening direction · seal detail · frame depth
Review a wider sill section around the selected rail and panel layout. Roller loads, rail attachment, drainage outlets and support beneath the threshold are part of the system design.
Track layout · panel weight · support locations
Coordinate the visible step with the interior floor, exterior paving and water-management detail. A low threshold needs the complete opening and installation to work together.
Floor build-up · exposure · access requirements
Check jamb feet, corners, end blocks and seal compression against mating drawings.
Coordinate exterior fall, outlets, end sealing and the sill-to-building interface.
Define bearing beneath the threshold, fixings and concentrated loads from tracks or traffic.
Review thermal, air, water and access requirements for the proposed door and installation.
Start with the mating section and purchase requirements. F1 reviews tooling and material selection, agrees the sample inspection criteria, then confirms the production and delivery scope in the quotation.
Confirm the required laminate data and door-system evidence during development. Performance of a complete door cannot be inferred from a threshold profile alone.
It is a glass-fiber-reinforced polymer section used at the bottom of a door opening. A pultruded threshold has a continuous cross-section along its length. GRP door sill, FRP threshold and fiberglass sill profile are related purchasing terms; the drawing defines the actual component.
A threshold can be developed for these frame materials, but the interfaces must be checked for the specific system. Supply the mating frame, seal and fixing drawings. Material choice alone does not establish compatibility with an existing frame series.
The starting scope is the pultruded profile, with cut lengths and machining agreed at quotation. Specify seals, end blocks, connectors, rails and assembly separately if needed. These components are not automatically included with a profile order.
A composite section can help limit a conductive path through the sill, but whole-door performance also depends on the leaf, frame, glazing, metal components, seals and installation. Thermal and weather-performance claims require evidence for the complete proposed configuration.
Send the section drawing, required lengths and demand. F1 will review tooling, manufacturing feasibility, sample requirements and order quantity before quoting. Published concept drawings are not a stocked-size catalog.
Low-profile geometry can be reviewed as a design requirement. Confirm the applicable project access requirements, allowable step, approach surfaces and weather exposure with the designer. A low section on its own does not establish compliance for the installed entrance.
Send the mating frame section, the threshold dimensions and interfaces, the loads and drainage, and the supply details. We reply within one business day; a formal quotation follows once the specification and delivery are reviewed.