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***PRICING IS BASED ON $20 PER FOOT FOR A 16 FOOT SPAN. WE CUSTOM MAKE PRODUCT TO ORDER/LENGTH***
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Engineered by Nolan Structural Products
**Tired of bouncy, sagging, or uneven floors?**
Our Floor Joist Stiffening Strap System is a simple, engineered retrofit solution that dramatically improves the stiffness and feel of your floor — without tearing apart your home.
Use these straps when:
• Floor joists are undersized or over-spanned, causing bounce or vibration
• You notice floor movement or sag under load
• You’re adding heavy furniture, equipment or a kitchen island to an existing floor
• Joists have damage, notches, or holes that reduce capacity
• Limited headroom makes sistering or beams impractical
• You want to preserve finished floors without demolition
• You’re rehabilitating older homes for modern stiffness and comfort
The Problem
Even structurally sound floors can feel weak. Over time, or under heavier loads, you may notice:
• Floors that bounce or shake when someone walks by
• Soft spots or a springy feel in parts of a room
• Floors that sag under heavy furniture like kitchen islands, pianos, or aquariums
• Undersized or older joists that don’t meet modern stiffness expectations
• Cracked drywall, floor tiles, or ceiling joints caused by excess deflection
• Limited space that prevents adding beams or sistering joists
The Solution
The Floor Joist Stiffening Strap System attaches directly to the underside of existing wood joists, forming a tension tie that resists bending and flexing.
Each strap is made from galvanized A36 structural steel and fastened with Simpson Strong-Tie SDS25150 (¼″) structural screws — all included.
By adding this engineered tension reinforcement, your floor’s structural stiffness increases up to 120%, reducing deflection by 35–54% depending on joist size.
**No demolition. No sistering. No new beams. Just engineered results.**
Performance
|
Joist Size
|
Increase in Stiffness
|
Reduction in Deflection
|
|
2×4
|
120%
|
54%
|
|
2×6
|
92%
|
48%
|
|
2×8
|
77%
|
43%
|
|
2×10
|
64%
|
39%
|
|
2×12
|
55%
|
35%
|
• Verified through theoretical and test-based calculations.
• Compatible with 2×4 through 2×12 joists.
• Suitable for residential and light commercial retrofit applications.
Product Features
• Engineered & Tested – Designed by licensed structural engineer Richard Nolan, P.E.
• Easy Retrofit Installation – Fasten directly to existing joists from below
• High-Strength A36 Galvanized Steel – Corrosion-resistant and structural-grade
• Includes Simpson SDS25150 Screws – ¼″ diameter, engineered connection
• Modular Lengths – 3′ and 4′ straps plus 8″ connection plate for variable spans
• Made in the USA
What’s Included
• Floor Joist Stiffening Straps (3′ or 4′ length) for joists up to 16’ in length
• 8″ connection strap for joining 3' or 4' straps together
• Simpson SDS25150 ¼″ x 1½″ structural screws, 3/8" Nut Driver and 3/16" Drill Bit
Installation Overview
1. Align straps along the bottom of the joists.
2. Secure using the included SDS25150 screws through pre-drilled holes (2″ spacing).
3. Use the 8″ connector strap to extend length between joists.
4. Repeat for all joists in the affected area for maximum performance.
