Treated 3 Step String 35 degree (single piece)

Treated 3 Step String 35 degree (single piece)A treated 3 step stair string cut at a 35 degree pitch, supplied as a single piece measuring 1000mm x 270mm, this is a ready to fit component designed for constructing straight or quarter turn timber staircases in residential and light commercial settings across the UK. Specifications Material Softwood timber Treatment Pressure treated Nominal Size 1000mm x 270mm Profile 3 step cut string, 35 degree pitch Configuration Single piece Use Class Suitable

A treated 3-step stair string cut at a 35-degree pitch, supplied as a single piece measuring 1000mm x 270mm, this is a ready-to-fit component designed for constructing straight or quarter-turn timber staircases in residential and light commercial settings across the UK.

Specifications

What it's used for

• Forming the structural side panels of a 3-step staircase in gardens, decking areas, or raised timber platforms
• Replacing a damaged or worn stair string on an existing 3-step flight where the pitch is 35 degrees
• New-build timber staircase construction in residential properties, outbuildings, and garden studios
• Supporting treads and risers in external timber steps leading to a deck, veranda, or garden structure

Fitting and handling

Before installation, store the string flat in a dry, ventilated space and allow it to acclimatise to site conditions for at least 48 hours to reduce any movement after fixing. When fitting, secure the string to the newel posts or structural supports using appropriate timber screws or bolts, ensuring the tread housings are level before fixing treads in place. The pressure treatment provides a degree of protection against rot and moisture, but any cut ends exposed during installation should be treated with an end-grain preservative to maintain long-term durability, particularly on external applications.

FAQ

What does a 35-degree pitch mean on a stair string?

The pitch refers to the angle of the staircase rise. A 35-degree pitch is a common, comfortable gradient for residential stairs and determines how the step cut-outs are positioned along the string. If your existing staircase was designed at 35 degrees, this string will match the tread and riser proportions without requiring modification.

Can this treated stair string be used outdoors?

Yes. The pressure treatment makes this string suitable for sheltered external use, such as garden decking steps or outdoor platforms. For fully exposed situations, ensure any sawn or drilled ends are sealed with a timber preservative, and consider painting or staining the finished step assembly to extend the service life further.

Is this string supplied pre-cut or does it need trimming on site?

This string comes with the 3-step profile already cut at a 35-degree pitch, so it is ready to fit without major recutting. Minor trimming to suit your specific installation dimensions may still be needed at the top and bottom of the string, so measure your opening carefully before ordering.

For further staircase components to complete your project, browse the full range of newel posts at Nottage Timber Merchants. We supply trade and retail customers throughout Bridgend and South Wales, with next-day delivery available to many local postcodes.