Arch formers are pre-shaped templates that create smooth, consistent arches in doorways, windows and other openings. They save time and ensure precision in plastering and finishing work.

There are various types for different projects, from flexible options for custom curves to rigid formers for standard shapes.

What Are the Key Differences Between Flexible and Rigid Arch Formers?

Flexible arch formers offer adaptability for custom curves and non-standard openings. They can be bent to fit various arch shapes and sizes. This versatility makes them ideal for renovation projects or unique designs.

Rigid arch formers provide consistent, predefined shapes for standard arches. They're typically more durable and maintain their form under pressure. Rigid formers are best for jobs requiring identical arches across multiple openings, ensuring a uniform final result.

Are There Any Special Considerations When Using Arch Formers for Plastering in High-Moisture Spaces?

When using arch formers in high-moisture environments, consider these factors:

• Choose moisture-resistant materials like PVC to prevent warping
• Apply a moisture barrier or sealant to protect the arch former from water damage
• Ensure proper ventilation during and after plastering to facilitate drying
• Use moisture-resistant plaster or additives to improve durability
• Allow for longer drying times between coats to prevent trapped moisture

How Do I Determine the Correct Arch Former Size Needed for a Project?

To determine the correct arch former size, start by measuring the width of the opening at its base. Next, decide on the desired height of the arch at its peak. Consider the wall thickness and any decorative elements you plan to add.

With these measurements, choose the closest match and keep in mind that slight adjustments can be made during installation. Remember to account for small variations in the opening and allow for minor adjustments during the fitting process.

4 Top Pro Tips on How to Install an Arch Former for a Smooth Curve

• Pre-stress flexible formers: For flexible arch formers, slightly over-bend them before installation. It compensates for material memory, ensuring the final curve remains true after plaster application and curing.
• Create micro-texture: Use a fine-toothed comb or wire brush to create subtle striations on the arch former surface. This micro-texture improves plaster adhesion and reduces the risk of air pockets, resulting in a smoother finish.
• Use temporary supports: Install temporary, adjustable supports beneath the arch former during plastering. These allow for minor adjustments to counteract any sagging caused by wet plaster weight, ensuring a perfect curve.
• Apply thermal cycling: In temperature-sensitive environments, apply controlled thermal cycling to the installed arch former before plastering. This helps pinpoint and address any potential expansion or contraction issues.

Need Assistance?

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