The backer is set with at least 1/8" gaps between sheets to allow enough room for thinset to 'glue' edges while fiberglass tape on joints knits them together.

This list was poached from contractortalk.comHouse/with attached Garage General ConditionsFinalize plans and develop estimate with owner, architectSign contract and notice to proceedApply for PermitsSecure foundation permitSecure framing permitSecure electrical permitSecure plumbing permitSecure HVAC permitSecure miscellaneous permitsSite WorkClear and grub lotExcavator estimated houlySkid steer estimated hourlyTrucking estimated hourlyTopsoil strippingSkid steer estimated hourlyTrucking estimated hourlyPavement and sidewalk removalSkid steer estimated hourlyTrucking estimated hourlyRough gradingSkid steer estimated hourlyRelocation of existing natural drainageExcavator estimated houlySkid steer estimated hourlyRemoval of unsuitable soilSkid steer estimated hourlyTrucking estimated hourlyAccess roadsSkid steer estimated hourlyTrucking estimated hourlyDetoursProtection of existing structures and utilitiesEnvironmental considerationsInstall temporary power serviceInstall underground utilitiesFoundationLocate buildingSurveyInstall batter boardsExcavate for foundationsExcavator estimated houlyDrilling for garage pilesSkid steer estimated hourlyTrucking estimated hourlyFormingFootingsTotal lineal feet of footingTotal width of footingTotal thickness of footingsTotal cubic meters of footingsFoundations wallsTotal lineal feet of wallsTotal width of wallsTotal height of wallsTotal cubic meters of wallsGrade beamsTotal lineal feet of beamTotal width of beamTotal height of beamTotal number of 12"x12' concrete pileTotal cubic meters of beams and pilesCure basement walls for 7 daysStrip basement wall formsWaterproof/insulate basement wallsPerform foundation inspectionBackfill foundationSkid steer estimated hourlyFraming house and attached gargeInstall 1st floor joistsMud sill achor bolts Sill gasket2x6 Treated mud sill2x10 Spruce 4 ply beam3" Adjustable steel telepost2x10 Spruce joisting2x10 Spruce rim joists2x2 bridging Single joist hangers/nailsDouble joist hangers/nails3 1/4" coated nailsLay 1st floor decking3/4" T&G Fir sheating1 1/2" flooring screwsSub-floor adhesiveFrame 1st floor wallsExterior wallsTop, bottom and cap plates 2x6 spruce2x6 spruce studs 92 5/8"3/8" spruce sheathing2x10 spruce 2 ply header with 2x6 backer2x6 garge door rough frame and Brick moulding3 1/4" coated nails1 1/2" sheathing stapleHouse wrap (Tyvek) and tape3/8" house wrap staplesInterior wallsTop, bottom and cap plates 2x4 spruce2x4 spruce studs 92 5/8"2x4 spruce single plate door headerPlumbing wallTop, bottom and cap plates 2x6 spruce2x6 spruce studs 92 5/8"3 1/4" coated nailsCap plate and exterior wall backing poly flashing2x10 Spruce 4 ply beam2x6 drywall backingInstall 2nd floor joists2x10 Spruce joisting2x10 Spruce rim joists2x2 bridging Single joist hangers/nailsDouble joist hangers/nails3 1/4" coated nailsLay 2nd floor decking3/4" T&G Fir sheating1 1/2" flooring screwsSub-floor adhesiveFrame 2nd floor wallsExterior wallsTop, bottom and cap plates 2x6 spruce2x6 spruce studs 92 5/8"3/8" spruce sheathing2x10 spruce 2 ply header with 2x6 backer3 1/4" coated nails1 1/2" sheathing stapleHouse wrap (Tyvek) and tape3/8" house wrap staplesInterior wallsTop, bottom and cap plates 2x4 spruce2x4 spruce studs 92 5/8"2x4 spruce single plate door headerPlumbing wallTop, bottom and cap plates 2x6 spruce2x6 spruce studs 92 5/8"3 1/4" coated nailsCap plate and exterior wall backing poly flashing2x10 Spruce 4 ply beam2x6 drywall backingInterior stairs and landingsComplete roof framingManufactured Roof trusses and gables 24" o.c.2x6 gable ladders and fascia2x6 fasicaCardboard insulation baffels2x4 truss bracing and strapping2x4 ridge blocking1/2 roof sheathing1/2 sheathing clips3 1/4" coated nails2" sheathing staples3/8" insulation baffle staplesConduct framing inspectionDry InShingles210 Asphalt shinglesIce and water shieldAsphalt ridged cap1 1/4" shingle nailsAluminum gable flashingRoof vents1st floor exterior doorsFront door 36/80 6 panel with side liteWeiser brush nickel passage and deadboltBack door 36/80 6 Panel Weiser brush nickel passage and deadboltGarage man door to house 36/80 6 panel with closerWeiser brush nickel passage and deadboltGarage doors 9x7 Barcol inusulated with Genie opener1st floor windows2nd floor windowsExterior FinishesEavesAluminum vented soffit (white)Aluminum fascia5" Gutter and down spoutsStuccoScaffolding1 1/2" styrofoam insulationStucco base coatStucco finish coatPargingStone workShingle gablesExterior Decks and StairsUtility Rough-Ins and Complete ConcreteRough-in plumbingConduct rough-in plumbing inspectionPlace concrete for basement floorRough-in electricalConduct rough-in electrical inspectionRough-in HVACConduct rough-in HVAC inspectionRough-in communication - phone, cable, computer, alarmInterior FinishesInsulationWall insulation - 1st floorR20 fiberglass batt 6ml vapor barrierWall insulation - 2nd floorR20 fiberglass batt 6ml vapor barrierCeiling insulation - 2nd floorR40 Blown in cellulose 6ml vapor barrierConduct insulation inspection3/8" vapor barrier StaplesTuck tapeAcostical chalkingDrywallInstall drywall - 1st floor wallsInstall drywall - 1st floor overheadInstall drywall 2nd floor wallsInstall drywall 2nd floor overheadTape and float 1st floor drywallTape and float 2nd floor drywallPaintTexture all except entry and kitchen - 1st floorPaint all except entry and kitchen - 1st floorHang wallpaper entry and kitchen - 1st floorTexture all - 2nd floorPaint all - 2nd floorPaint exterior siding & trim workCabinetsInstall 1st floor - kitchen cabinetsInstall 1st floor - master bath and guest cabinetsInstall 2nd floor - hall bath and private bath cabinetsInstall chair rails, crown moldings, trimFinish PlumbingComplete 1st floor - kitchen plumbingComplete 1st floor - master bath and guest plumbingComplete 2nd floor - hall bath and private bath plumbingConduct finish plumbing inspectionFinish ElectricalComplete 1st floor circuits to service panelComplete 2nd floor circuits to service panelConduct finish electrical inspectionComplete communications wiring - phone, cable, computer, alarmFinish HVACComplete 1st floor - zone 1 HVACComplete 2nd floor - zone 2 HVACConduct HVAC inspectionCarpet, Tile and AppliancesTile entry, kitchen and bathsCarpet 1st floorCarpet 2nd floorInstall appliancesLandscaping and Grounds WorkPour concrete driveway and sidewalksInstall backyard fenceSod and complete plantings - front yardSod and complete plantings - backyardFinal AcceptanceComplete final inspection for certificate of occupancyCleanup for occupancyPerform final walk-through inspectionComplete punch list items

Looked good, better than the fiberglass counter top. :)

Replacing the shower valve is a problem that will usually lead to a bigger job too.The cheapo permanent solution is to remove the old tub and to come back in with a 3 piece fiberglass tub and surround.

(Supposedly you can't to fiberglass ones.)27.

Fix the apartment -- rip out the drywall on the exterior walls and insulate the hell out of that place with fiberglass or rock wool.

I just replaced a two piece fiberglass surround shower this week.

Florida specific brand white PVC windows: double-hung, and fiberglass doors, including taxes and permit

Its a rental,  so it should be a full one piece fiberglass install,  and Add a ventilation fan and ideally hook it up to an automatic humidity sensor switch  (good upgrade too for any bathroom that doesn't have it).    

-took everything out the kitchen b/c it was molded...don't know why she spent the money on her mortgage instead of repairing the kitchen-taking a shower in the tube and the tub cracked...was an old fiberglass tub-part of the bathroom floor seemed to be leaning in...let landlord know...but from the smell it seemed to have started rotting the beams below long before we moved in-house ran on screw fuses and half the house was on one circuit...fuses were constantly blowing and the house nearly burned down b/c the wrong type of receptacles were installed throughout the house-went to get the HVAC checked out and the whole system need to be replaced, but would work b/c the entire electrical system in the house need to be repaired first (which was not in the scope of our agreement and let the landlord know)In the end, everything fell apart.