How to Install a Bath and Shower Surround
Step-by-step guide to installing a direct-to-stud acrylic bath and shower surround, including stud prep, plumbing cutouts, dry fitting, and fastening.
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🧰 Required Tools & Equipment
- ✓ Cordless drill and driver bits
- ✓ Hole saw set (matching valve and spout diameters)
- ✓ 4-foot spirit level
- ✓ Tape measure
- ✓ Pencil
- ✓ Caulk gun
📦 Materials & Supplies
- ✓ Delta Classic 400 wall surround kit
- ✓ 1-1/4 inch stainless steel or galvanized truss-head screws
- ✓ 100% silicone tub and tile sealant
- ✓ Wooden shims
- ✓ 2x4 lumber for stud blocking
⚠️ Safety Checkpoints & Warnings
- • Wear safety glasses when drilling acrylic panels to protect against high-speed plastic chips.
- • Verify the main water supply is completely turned off before measuring around exposed plumbing rough-ins.
- • Ensure firm footing inside the tub by laying down a drop cloth or cardboard protector to prevent slipping or scratching the basin.
📋 Step-by-Step Guide (6 Steps)
Check Studs and Install Blocking
Place a 4-foot level vertically and horizontally across the framing studs around the bathtub. Add wood shims to low studs and install horizontal 2x4 blocking at the height of the surround top and side flanges for secure fastening. Ensure the corner studs are plumb and square within 1/8 inch across the alcove.
- • Level vial bubbles centered on all three surrounding wall frames
- • Horizontal 2x4 blocking flush with existing studs at the specified flange height
- • Skipping corner blocking, leaving the side flange edges unanchored
- • Failing to shim bowed studs, causing the surround wall to warp or buckle
Dry Fit the Center Back Panel
Set the center/back surround panel onto the tub's mounting lip and push it tight against the back framing. Verify that the bottom edge sits completely down over the tub ledge and that the top mounting flange is level across its entire length. Mark stud locations directly onto the panel’s upper fastening flange using a pencil.
- • Back panel resting flat on the tub ledge without tilting
- • Pencil tick marks aligned with stud centerlines on the top flange
- • Forgetting to check the tub ledge for debris, causing the panel to sit crooked
- • Not centering the back panel evenly between left and right side walls
Measure and Cut Plumbing Holes on Side Panel
Measure from the back panel face and tub rim to the centers of the mixing valve, tub spout, and shower arm. Transfer these measurements precisely to the plumbing side panel, double-checking dimensions before drilling. Use hole saws running at medium speed with light pressure to drill through the panel from the front finished face.
- • Clean, circular cutouts in the side panel corresponding to valve and spout rough-in locations
- • No spidering cracks or melted plastic edges around the drilled holes
- • Measuring from the stud frame instead of the installed back panel face
- • Drilling aggressively with high feed pressure, cracking the acrylic
Interlock Side Panels and Dry Fit System
Slide the non-plumbing side panel into position by engaging its interlocking edge into the back panel’s vertical groove. Slide the drilled plumbing side panel over the rough-in pipes and engage its joint with the back panel. Verify that all joints fit tightly along their full vertical seam without gaps.
- • Interlocking vertical joints fully closed with zero gap top to bottom
- • Both side panels flush against the front framing studs and resting flat on the tub ledge
- • Forcing the interlock before ensuring the bottom corner is fully seated
- • Misaligning the top flange height between back and side panels
Fasten Surround Panels to Studs
Pre-drill pilot holes through the panel flanges at every stud location using a drill bit slightly larger than your screw shank. Drive 1-1/4 inch truss-head screws into the pre-drilled holes until the head sits snug against the flange. Do not countersink or overtighten, as this will crack the plastic flange.
- • Truss-head screws driven through every stud marker on the top and side flanges
- • Screw heads seated flat against the flange without distorting or fracturing the plastic
- • Driving screws directly without pre-drilling pilot holes, instantly cracking the flange
- • Using bugle-head drywall screws that pull through and shear the flange edge
Seal Joints and Perimeter with Silicone
Clean all joints and the bottom tub seam with rubbing alcohol to remove dust and oils. Cut the silicone tube nozzle at a 45-degree angle to produce a 1/8-inch bead and apply a smooth, continuous line of 100% silicone sealant along vertical seams and outer wall transitions according to the manufacturer's specified sealing pattern. Smooth the bead with a silicone profiling tool or a gloved finger.
- • Continuous, uniform bead of silicone filling seams and transitions without voids or blobs
- • Neat, smooth concave sealant surface with no excess smeared on tub faces
- • Sealing the bottom weep channels if the specific model relies on open drainage
- • Applying silicone over dusty, damp, or contaminated acrylic surfaces
Credit: inspired by an original tutorial by Everyday Home Repairs — watch the original on YouTube.
Don’t have everything?
- No Hole saw set? Spade drill bit or step drill bit running at low speed
- No Truss-head screws? Galvanized roofing nails or pan-head screws with stainless steel flat washers