Intro

On most bathroom jobs, the leak isn’t the glass. It’s the seal. Getting shower screen & silicone work right stops call-backs, mould, and client stress. In this guide, you’ll learn how to plan, fit, and seal a shower screen with clean, durable silicone. We’ll cover tools, bead size, curing times, and common fixes. You’ll also see how to hand over the job so the client knows how to care for it. Follow these steps and your shower screen & silicone finish will last.

Quick Answer

A solid shower screen & silicone job comes down to clean prep, the right neutral-cure sanitary silicone, a 4–6 mm bead, and full cure before use. Mask, apply at 45°, tool once, and let it cure 24 hours (48 in cold or damp rooms). Never trap water by sealing internal weep paths.

Table of Contents

• Site Assessment And Planning
• Tools, Materials, And Silicone Types
• Install The Screen The Right Way
• Silicone Sealing: Clean, Mask, Apply, Tool
• Curing, Testing, And Handover
• Common Mistakes And How To Fix Them
• Pricing, Scope, And Simple Admin

Key Takeaways

• Prep is 80% of shower screen & silicone success.
• Use neutral-cure sanitary silicone; aim for a 4–6 mm bead.
• Allow 24–48 hours cure before use; colder rooms need longer.
• Don’t block drainage paths; seal outside verticals only.
• Document scope, cure time, and care to avoid call-backs.

Site Assessment And Planning

Good planning makes shower screen & silicone work simple.

1. Check levels and plumb. Tiles, tray, and walls should be within 2 mm over 1 m.
2. Confirm tray fall. Aim for 5–10 mm fall per 1,000 mm towards the waste.
3. Identify gaps. If the wall bows, plan packers or adjustable profiles.
4. Mark wet zones. Where will water hit? That’s where your silicone must be perfect.
5. Agree the scope. Inside base only, outside verticals, and floor junctions. Put this in your quote so it’s clear.

Tip: If you’re also looking to streamline professional proposals, our guide covers how to set scope, exclusions, and cure times clearly.

Tools, Materials, And Silicone Types

You don’t need every gadget. You need the right ones.

• Cartridge gun (smooth rod is best for control)
• Neutral-cure sanitary silicone (with mould inhibitor)
• Surface cleaner: isopropyl alcohol (IPA) or methylated spirits
• Masking tape, 12–18 mm wide
• Plastic scraper and hook blade for removal
• Backer rod for joints deeper than 8–10 mm
• Microfibre cloths and nitrile gloves

Silicone choices:

• Neutral-cure sanitary: Best for most shower screen & silicone jobs. Safe on natural stone, mirrors, and metals. Low odour.
• Acetoxy-cure: Cures faster, smells of vinegar, can attack stone and mirror backing. Use with care.

Spec tip: Look for sealants labelled for sanitary areas and compliant with EN 15651-3 (Sanitary). White, clear, and grey are common. Clear hides less; white often looks sharper on white trays.

Install The Screen The Right Way

A clean fit makes sealing easy.

1. Dry-fit first. Check door swing, magnet closure, and 2–3 mm clearances.
2. Mark holes. Use masking tape on tiles to prevent drill slip. Drill slow. Use 6 mm or as per fixings.
3. Seal behind wall profiles only if the manufacturer requires it. Many want a thin internal bead to stop capillary leaks.
4. Pack and plumb. Use 1–3 mm packers if the wall is off. Check spirit level both ways.
5. Tighten fixings evenly. Don’t twist frames. Over-tightening can bow the profile and cause gaps.

On most kits, you’ll silicone the outside verticals and the tray junction last. Follow the manual, but keep drainage paths open.

Silicone Sealing: Clean, Mask, Apply, Tool

This is the heart of shower screen & silicone work. Go slow. Do it once.

1. Remove old material

   • Cut both sides of old beads with a hook blade.
   • Scrape residue with a plastic scraper to avoid tile damage.

2. Clean and dry

   • Wipe with IPA. Wait 2–3 minutes for full evaporation.
   • Surfaces must be bone dry. Use a low heat gun briefly if needed.

3. Mask neatly

   • Tape both sides of the joint, leaving a 3–5 mm reveal.
   • Tighter tape equals a sharper line.

4. Cut the nozzle

   • 45° angle. Hole 4–6 mm to match your target bead.
   • Puncture the inner seal cleanly.

5. Apply silicone

   • Hold the gun at 45° and pull towards you.
   • Keep steady pressure. Don’t stop-start.
   • Fill the joint fully; avoid hollow spots.

6. Tool the bead

   • Lightly mist your tool with soapy water or use none at all for better adhesion. Don’t flood it.
   • Tool once, with firm, even pressure. One pass is cleaner than three.

7. Pull the tape

   • Remove tape immediately, pulling back on itself at 45°.
   • If edges lift, re-tool lightly without adding more silicone.

8. Gap rules

Where to seal:

• Outside verticals: Yes. Prevents water tracking out.
• Inside verticals: No. Leave weep paths for framed screens.
• Tray junction: Seal where glass profile meets tray, usually outside. For wetrooms, seal the floor-tile junctions as per design.

Curing, Testing, And Handover

Good shower screen & silicone work still needs time to cure.

1. Cure time

   • Standard: 24 hours at 20°C and average humidity.
   • Cold, damp bathrooms: 36–48 hours. Tell the client in writing.

2. Water test

   • After cure, run the shower for 2–3 minutes, aiming at joints.
   • Check outside edges and below the tray for drips.

3. Finishing touches

   • Trim any tiny tags with a sharp blade once fully cured.
   • Wipe frames and glass. Leave the area spotless.

4. Client handover

   • Explain cure time and first clean: no harsh chemicals, no abrasives.
   • Maintenance: Wipe dry after use, inspect beads every 6–12 months.

Tip: This pairs well with understanding project timelines so clients know when they can use their bathroom.

Common Mistakes And How To Fix Them

Most call-backs on shower screen & silicone work are avoidable.

• Sealing inside verticals on framed screens

  • Problem: Traps water; causes mould and premature failure.
  • Fix: Remove internal beads; leave weep paths open. Seal outside only.

• Smearing and multiple tooling passes

  • Problem: Messy lines, poor adhesion.
  • Fix: Tool once with steady pressure. Less slip solution is better.

• Thin or hollow beads

  • Problem: Pinholes, leaks.
  • Fix: Cut a larger nozzle (4–6 mm). Push sealant into the joint.

• Applying on damp tiles

  • Problem: Adhesion fails; bead peels.
  • Fix: Fully dry surfaces. Use IPA and allow 2–3 minutes flash-off.

• Wrong silicone

  • Problem: Staining on stone, mirror de-silvering, mould.
  • Fix: Neutral-cure sanitary with fungicide. Check EN 15651-3.

• Ignoring movement joints

  • Problem: Cracking in corners.
  • Fix: Use backer rod and a flexible bead. Allow for 1–2 mm movement.

If you’re pricing complex reseals, see our notes on pricing strategies so you don’t under-allow for removal time and drying delays.

Pricing, Scope, And Simple Admin

Shower screen & silicone jobs seem small, but details matter.

• Scope clearly

  • List exactly where you will seal: outside verticals, tray junction, floor joints.
  • Add cure times: 24–48 hours “no use”.
  • Exclusions: Hidden leaks, tray movement, failed tanking.

• Allow time

  • Removal and prep: 30–90 minutes depending on old silicone.
  • Drying: Allow 2–3 minutes after cleaning; longer if walls were damp.
  • Curing: 24–48 hours before client use.

• Variations

  • Bowed walls, wide gaps (>6 mm), or crumbling grout need extras. Note them early.

• Simple paperwork

  • Capture site photos and voice notes, then turn them into a clear quote. Tools like Donizo let you record details on site, generate a branded proposal, get e-signature, and convert it to an invoice in one click.

If you need reusable invoice templates that save time, our resource on invoice templates can help you bill fast and clean.

FAQ

How long before the client can use the shower?

Allow 24 hours at 20°C for standard cure. In cold or damp rooms, allow 36–48 hours. Always tell the client in writing and post a “Do not use” note if needed.

Which silicone is best for shower screens?

Use neutral-cure sanitary silicone with a mould inhibitor. It’s safe on stone, mirrors, and metals. Check the label for sanitary use and EN 15651-3 compliance.

Do I seal inside or outside of the screen?

Seal outside verticals and the tray junction. Do not seal inside verticals on framed screens; you’ll block weep paths and trap water.

How big should the silicone bead be?

Aim for a 4–6 mm visible bead. If the joint is deeper than 8–10 mm, use backer rod and target a 2:1 width-to-depth ratio.

Can I apply silicone on damp tiles?

No. Silicone needs a clean, dry surface. Wipe with IPA, let it evaporate for 2–3 minutes, and make sure the area is fully dry before you apply.

Conclusion

Clean prep, the right product, and patient curing are what make shower screen & silicone jobs last. Keep beads 4–6 mm, protect weep paths, and document cure times. Next steps: 1) Standardise your tooling method. 2) Add clear scope and exclusions to every quote. 3) Photograph before/after and record cure instructions in writing. For simple admin, platforms such as Donizo help you capture details, send proposals, get e-signatures, and invoice fast. Do the basics right, and your work stays dry and tidy for years.

• If joint depth exceeds 8–10 mm, insert backer rod. Aim for a 2:1 width-to-depth ratio.
• Standard visible bead: 4–6 mm wide, 2–3 mm deep.