Flagstones – Hereford Green Sandstone

Each 19m2 crate of Hereford Green sandstone flagstones covers 19 square metres with a mix of 62 pieces in 5 sizes:

• 280mm x 560mm – 17 pieces
• 420mm x 560mm – 11 pieces
• 560mm x 560mm – 14 pieces
• 700mm x 560mm – 9 pieces
• 840mm x 560mm – 11 pieces

Each 11m2 crate of Hereford Green sandstone flagstones covers 11 square metres with a mix of 33 pieces in 5 sizes:

• 280mm x 560mm – 6 pieces
• 420mm x 560mm – 7 pieces
• 560mm x 560mm – 5 pieces
• 700mm x 560mm – 6 pieces
• 840mm x 560mm – 9 pieces

Its advisable to allow an additional 10% on top of the area required for breakages, cutting etc.

Hereford Green sandstone flagstones are suitable for both interior and exterior flooring. Indoors, these flagstones work really well with underfloor heating, spreading and retaining the warmth throughout the stones. Outdoors, they are perfect for courtyard gardens, patios, pathways, seating areas and stepping stones.

Outdoors, these flagstones can be laid on a sand and cement bed. Ensure the screed bed is level, and if needed use a sub-base. Spot bedding is not recommended as its makes the flagstones unstable and susceptible to fracturing.

As our Hereford Green sandstone flagstones are all 560mm wide they can be laid in “tram lines” or they can be laid in a completely random pattern.

To keep a traditional, random pattern there are 3 rules:

1.  Do not have 4 corners meeting

2.  Have no more than 3 joins running parallel

3.  Do not have joins running for longer than around 3 metres. You may want to reduce this length if the overall area is small.

Joint widths are a personal decision, but a 12mm gap is standard. We recommend Jointex Easy as a fixing mortar. It’s ready mixed, easy to use, doesn’t stain the flagstones and creates a very neat professional finish. It is permanently water permeable, resistant to high pressure cleaners and helps prevents weeds. Just empty the tub onto wet flagstones and work it into the joints, making sure they are firm and compact; then wait for it to dry.

Personally we don’t seal flagstones for outdoor use, because we think they improve with weathering. However you can seal them if you prefer.

Indoors we would definitely recommend sealing flagstones, to protect them from grease marks and household staining. It is essential to use a sealant specially made for natural stone, and we sell a range of high quality sealants for you to choose from. Some of the flagstones are more porous than others so the number of coats required will differ from one type of flagstone to another.