Treated 5 Step String 35 degree (single piece)

Treated 5 Step String 35 degree (single piece)This treated 5 step string at 35 degrees is a single piece stair string designed for straight staircase construction. Cut to accept five treads and risers, it measures 1674mm x 260mm and arrives pressure treated for improved resistance to moisture and decay, making it suitable for internal and sheltered external stairs. Specifications Attribute Detail Material Softwood timber Treatment Pressure treated Nominal Size 1674mm x 260mm Steps 5 step Angle 35

This treated 5 step string at 35 degrees is a single-piece stair string designed for straight staircase construction. Cut to accept five treads and risers, it measures 1674mm x 260mm and arrives pressure treated for improved resistance to moisture and decay, making it suitable for internal and sheltered external stairs.

Specifications

What it's used for

• Constructing straight five-step staircases in domestic properties, including hallways and landing access points
• Replacing a damaged or rotten string on an existing five-step staircase where the pitch is 35 degrees
• Garden steps and sheltered outbuilding staircases where a treated timber string is needed for moisture resistance
• Decking access steps and raised platform entry where a shaped, pre-cut string saves on-site cutting time

Fitting and handling

Store the string flat and off the ground in a dry, ventilated space before fitting, even though it is pressure treated, as this reduces movement once installed. When fixing, use joist hanger screws or structural timber screws rated for treated timber, as standard bright steel fixings can react with the preservative chemicals and corrode prematurely. If the string will be painted or varnished on completion, allow the timber to dry to below 20 percent moisture content before applying any finish coat.

FAQ

What angle should a staircase string be for a standard UK domestic stair?

Building Regulations Approved Document K sets the acceptable pitch for a private stair between 30 and 42 degrees. A 35 degree string sits well within this range and is one of the most common pitches used in UK housebuilding, making this string a direct fit for many standard staircase layouts.

Can this treated string be used outdoors?

The pressure treatment improves resistance to rot and fungal attack, so this string is suitable for sheltered external applications such as garden steps or outbuilding access stairs. For fully exposed outdoor use, ensure the end grain is sealed after cutting and that the string is well supported to prevent water pooling.

Is this string supplied as one piece or do I need to buy two?

This listing is for a single piece only. A standard staircase requires two strings, one for each side, so you will need to add two to your basket if you are building or replacing a complete stair. Check that both the pitch angle and step count match your existing staircase before ordering.

For other staircase components to complete your project, browse the full range of newel posts and stair parts at Nottage Timber Merchants. We supply trade and retail customers across Bridgend and South Wales, with next-day delivery available to local areas on stocked lines.