Key Performance Features

• Weatherproof Protection – Designed to form an impermeable barrier against driving rain, heavy snow, drafts, and insects.
• Integrated Wooden Insert – Comes equipped with a durable wood sub-structure that reinforces the threshold, enhances thermal insulation, and dampens hollow stepping sounds.
• Anodized Black Finish – The industrial-grade black coating resists scratches, corrosion, and heavy wear, ensuring a premium clean look over years of use.
• Heavy-Duty Aluminum Sill – Extruded from high-strength aluminum that will not warp, crack, or flex under heavy residential or commercial traffic.
• Universal Application – Ideal for front entryways, back doors, utility rooms, and commercial storefront assemblies.

Technical Specifications

Installation & Fitting Guide

Follow these steps for a straightforward and secure installation:

1. Preparation: Remove the old threshold and completely clean the subfloor. Ensure the surface is level and dry.
2. Dry Fit: Place the Blulu Threshold into the opening to check alignment. Trim slightly if required by your specific door jamb.
3. Sealing (Pro-Tip): Apply a heavy bead of high-quality exterior silicone sealant underneath the aluminum sill and wooden insert to prevent water from sweeping under the threshold.
4. Fastening: Secure the threshold to the subfloor using appropriate wood or concrete screws (not included) through the pre-designated points.
5. Testing: Close the door to ensure the bottom weatherstrip creates a tight, consistent seal against the threshold cap.

Why Choose Blulu Door Sills?

Drafty doors can account for up to 15% of a building's heating and cooling loss. The Blulu 5-5/8" Wide Door Sill offers a comprehensive solution by bridging the entire depth of standard exterior framing. Its heavy weight of nearly 5 lbs proves its commercial-grade material density, ensuring that it won't dent from heavy boots, equipment, or hand trucks. Invest in durability and lower your energy bills with a single upgrade.