How to Install Mattress and Box Spring Encasements

Why this matters

An encasement does two jobs: it seals whatever bed bugs and eggs are already in the mattress or box spring inside, where they cannot feed and eventually die, and it turns the most complicated surface in the room into a smooth one where any new activity shows at a glance. It does neither job with the zipper six inches open, a corner torn on a box spring staple, or a cover the customer took off to wash after two weeks. Encasements fail at installation and in the month after, almost never in the fabric. This card owns fitting them so they work and telling the customer how to keep them working. Whether a given mattress is worth encasing at all is a separate call, made first. See related: Bed Bug Mattress Encase vs Dispose Decision Tree.

Before the box is opened

Use encasements made for bed bugs. A waterproof mattress protector or an allergy cover is not the same thing. A bed bug encasement has a zipper with teeth fine enough that a first instar cannot pass between them, and an end stop or lock at the closed end so the pull cannot creep open. Check the packaging says it is designed and tested for bed bugs.

Measure, do not ask. Customers know the bed is "a queen"; they rarely know it is a 15 in pillow-top. Standard US mattress footprints are twin 38 x 75 in, full 54 x 75 in, queen 60 x 80 in, king 76 x 80 in and California king 72 x 84 in. Depth is what varies, and an encasement is sold for a depth range. Too shallow and you strain the zipper at the corners until it splits; too deep and loose fabric bunches and snags on the frame. Measure the depth at the middle of a long side, compressed lightly, and pick the encasement whose range includes it.

Protect yourself and the room. You are handling bedding that may be carrying live bugs. Gloves on. Keep your bag and the encasement packaging on a hard floor in the doorway, not on the bed or carpet. Mattresses are two-person lifts; tip them on edge rather than lifting them flat.

The steps, and what each one is guarding against

1. Inspect the mattress and box spring before covering them. Seams, piping, tag, handles, and the box spring underside, in the order set out in 'How to Inspect a Bedroom for Bed Bugs', judging each find against 'Bed Bug Evidence Field Guide'. You need the record of what was sealed in, and if the mattress is far worse than the decision assumed (torn fabric, a heavily stained box spring with live bugs throughout), you go back to the encase-or-dispose call before spending the encasement. What it guards against: encasing a mattress that should have gone, and having no record of what was inside.

2. Clear the frame of anything sharp. Look for screw heads, metal burrs on a frame rail, hooks on an adjustable base. Cover them with tape or ask the customer to replace them. What it guards against: the encasement being cut from outside on the first night, which nobody notices until bugs are seen walking out.

3. Tape the box spring corners. Box spring corners are hard, and the dust cover underneath is stapled. Run a couple of wraps of tape over each corner and over any staple heads that stand proud. What it guards against: a corner tear in the first week. This is the most common failure on box springs.

4. Fit the encasement with two people, open end at the foot. Stand the mattress on edge at the foot of the bed, or lay it on the frame. Open the encasement fully, pull it over the head end first like a pillowcase, then work it down evenly from both sides toward the foot. Do not drag it along the mattress from one side; that twists the seams and loads the zipper at one corner. What it guards against: a twisted cover that puts the zipper under tension at a corner.

5. Close the zipper all the way, slowly, by hand. Walk the pull around the full length with one hand while the other holds the fabric flat ahead of it. Watch for fabric caught in the teeth. At the end, seat the pull fully into the end stop or lock pocket the maker provides. What it guards against: a gap at the end of the run, which is where the encasement leaks.

6. Lock it. If the encasement has a locking flap or a hook-and-loop pocket over the pull, close it. If it does not, run tape over the pull and the last couple of inches of teeth. What it guards against: the zipper creeping open over weeks of the bed being made and unmade.

7. Check the whole surface for tears and holes. Run your hand and the beam over every seam and face, especially the corners and the underside. A small hole is sealed with tape according to the encasement maker's instructions, or the encasement is replaced. What it guards against: a defect you created during fitting.

8. Repeat for the box spring, then put the bed back together and confirm nothing on the frame touches the zipper end.

9. Tell the customer the three rules, and leave them in writing.

What the customer has to do

Most encasements that fail were removed, not broken. The conversation is short and specific:

TECH: Leave both covers on for at least a year, even after we're done treating. Anything sealed in there can survive months without feeding. CUSTOMER: Can I wash it? TECH: Put a regular mattress pad and sheets over it and wash those. Don't unzip it. If you ever have to, call us first. CUSTOMER: What about when I change the sheets? TECH: Look at it. Corners, zipper end. If you see a tear or a bug on the outside, call us that day.

The written version goes on the service record and the customer's copy: leave on, do not open, check the seams and zipper end when changing sheets, report any tear or any bug seen.

Worked example: a queen pillow-top with a stapled box spring

The setup. Confirmed infestation in the main bedroom: fecal spotting and cast skins at the head-end piping on the wall side, one live adult and eggs on the box spring frame rail. The encase-or-dispose call kept both pieces, because the mattress fabric is intact and the evidence is localized.

Measuring. Mattress footprint 60 x 80 in, a queen. Depth at mid-side, lightly compressed: 15 in. The van carries queen encasements in two depth ranges, one covering 9 to 12 in and one covering 12 to 18 in. 15 in falls in the second. Box spring: 60 x 80 in, 9 in deep, so the shallower range. A 15 in mattress forced into a 12 in maximum would have put the zipper under strain at every corner.

Inspection before covering. Matches the earlier findings, nothing new. Recorded.

The frame. A metal frame with one rail bolt head standing about a quarter inch proud at the head end, wall side, the same corner as the infestation. Taped over.

The box spring. Four corners taped, and two staples standing proud on the underside near the head end taped flat. Encasement fitted over the head end first, worked down evenly, zipped to the end stop, pull pushed into the locking pocket and the flap closed. Hand-and-beam check: clean.

The mattress. Fitted the same way. At the last corner the zipper stops 1 in short of the end stop: a fold of fabric is caught in the teeth. You back the pull off about a foot, free the fold, and close it again. Lock flap closed.

The check that found the problem. A tech who closed the zipper by feel and stood up would have left a 1 in gap at the foot corner. The two states look like this at the end of the run:

 by feel: a fold in the teeth stops the pull
   =|=|=|=|=|=|=|=|=[pull] | | | | [end stop]
                           <- 1 in ->
                           open teeth: a way out
 by eye: fold freed, pull fully into the stop
   =|=|=|=|=|=|=|=|=|=|=|=|=|=|=|=[pull][end stop]
                                [ lock flap closed ]

A first instar passes through far less than that gap.

The record: "Mattress: queen 60 x 80 x 15 in, encased, deep range. Box spring: 60 x 80 x 9 in, encased, standard range, corners and two staples taped. Frame bolt head taped, head end wall side. Both zippers seated in end stop and locked. Surface checked, no defects. Customer given leave-on, do-not-open, check-and-report instructions in writing."

Reading an encasement at the follow-up

The smooth cover is a monitoring surface, so the follow-up visit reads it before anything else is touched.

• Zipper end first. Still seated and locked? A pull that has crept even an inch out of the end stop is re-seated and taped, and the record says it had moved.
• Fresh spotting or live bugs on the outside. With the zipper seated and no tear, anything sealed inside cannot reach the outer face, so activity on the outside is coming from somewhere else: the frame, the headboard, the nightstand, or a second harborage in the room. That redirects the visit to those points.
• Tears at corners and along the frame rail. Patched or replaced the same day, and the surface around the tear inspected.
• The cover off, or a mattress pad never added. Ask, without accusing. A customer who has taken it off to wash has usually done it once and can be told why it matters.

What changes the method

An adjustable base or a platform bed with no box spring. Encase the mattress; the base is a frame inspection and treatment item, not an encasement item. Hinges and motors on an adjustable base are sharp; tape or pad what touches the cover.

A pillow top over 18 in, a split king, or a nonstandard size. Order to the measurement rather than forcing the closest stock size. Note on the record that the bed is waiting on a part.

Pillows. Pillow encasements exist and some programs use them; many shops treat pillows by laundering on high heat instead. Follow the program.

A tear found at a later visit. Patch or replace on the spot, inspect the surface around the tear for activity outside, and record it. A torn encasement on a treated bed is a callback in the making.

How to verify it is right

• Each encasement's depth range includes the measured depth of what it covers.
• Both zippers are seated fully in their end stops and locked, checked by eye, not by feel.
• No tears, no holes, nothing on the frame touching the cover.
• The customer has the three rules in writing, and the record lists sizes, depths, what was taped and what was found.

References

• See related: Bed Bug Mattress Encase vs Dispose Decision Tree
• See related: How to Inspect a Bedroom for Bed Bugs
• See related: Bed Bug Evidence Field Guide
• Encasement manufacturer's fitting and repair instructions