Golf Haven Lux Shed: Gen 2 Four-Season Design Package

Section 1 · Design Basis

What Gen 2 must survive

The Gen 1 set was a good-looking building with coordination gaps. Gen 2 is defined by four non-negotiables, each traced to a specific failure mode of the Gen 1 drawings:

Non-negotiable	Gen 1 condition	Gen 2 requirement
Roof that sheds	1:12 metal, warranty risk, ice damming	2:12 standing seam, full ice-and-water, snow guards, heated eave rough-in
One envelope, one truth	Contradictory R-values between A2.1 and A2.2	Single assembly schedule (Section 3) keyed to every sheet
Breathable occupancy	Sealed box, no ventilation, condensation risk at screen wall	ERV with dedicated supply at screen wall, dehumidify-capable heat pump
Heat at -35°C	Standard mini-split plus orphan baseboard, no load calc	Cold-climate heat pump plus sized backup heat, coordinated load calc

Design loads: ground snow 1.9 kPa (Winnipeg), wind per Manitoba Building Code, design temperature -35°C, occupancy up to 4 persons, continuous interior temperature 20°C with 10°C unoccupied setback.

Section 2 · Building Geometry

Same footprint, smarter section

The 15'-0" x 25'-0" clear plan is retained; it works for the simulator layout and the showroom story. The section changes: the roof rises to 2:12, and the high side is deliberately placed over the hitting zone so the tee sits under the tallest clearance in the room.

Figure 1: Gen 2 building section. High side of the 2:12 roof is placed over the hitting zone; ERV supply at the screen wall, exhaust at the seating zone; insulated skirt closes the pile plenum.

Key dimensions

Item	Gen 1	Gen 2
Clear plan	15'-0" x 25'-0"	15'-0" x 25'-0" (unchanged)
Roof slope	1:12	2:12
Low-side clear ceiling	10'-0"	10'-0" (unchanged)
High-side clear ceiling	~12'-1"	~12'-6" (over the tee)
Roof overhang	1'-0" three sides	1'-6" at low eave, 1'-0" sides
Hitting zone placement	Centered	Shifted to high side of the section

Section 3 · Master Assembly Schedule

One schedule, every sheet

This schedule replaces the contradictory callouts on A2.1 and A2.2. It is to be reproduced on its own sheet (new sheet A1.1) and every plan, section and elevation references it by assembly number. No R-value appears anywhere else in the set.

No.	Assembly	Layers, outside to inside	Performance
A1	Roof	Standing seam metal (2:12, manufacturer-confirmed low-slope profile), full-coverage ice and water, 5/8" ply, vented truss cavity with baffle vents, R-56 batt plus R-10 continuous rigid at ceiling plane option, 6-mil poly, 1/2" gypsum	R-56 nominal, vented
A2	Wall	Vinyl or Chamclad cladding, rainscreen strapping, 7/16" OSB, 2x6 cavity with R-24 batt, 6-mil poly (acoustical sealant all penetrations), 1/2" gypsum or plywood board-and-batten	R-24 cavity
A3	Wall, screen side	As A2 plus R-5 continuous rigid interior, black-painted 5/8" ply behind screen, padded panels	R-29 effective, warmest surface in room
A4	Floor	3/4" T&G ply, 2x12 joists, R-20 batt plus R-20 rigid under sheathing (no exposed batt), rodent mesh, closed insulated skirt around pile plenum	R-40 effective, wind-wash proof
A5	Foundation	Lawson screw piles, 14 kips ULS, 4-ply 2x8 beams, City of Winnipeg compliant	Unchanged from Gen 1
A6	Door	Berdick insulated-core steel, thermal threshold, full perimeter sweep, multipoint hardware	Eliminates door condensation line
A7	Ceiling penetrations	IC-rated airtight pot housings with gasketed trims only; surface linear fixtures over swing zone; no penetrations within the swing arc	Envelope integrity maintained

Section 4 · Mechanical Design

Heat, fresh air, dry air

Heating and cooling

Primary: cold-climate mini-split heat pump, sized 12,000 BTU/h nominal with maintained capacity at -30°C (Mitsubishi Hyper-Heat, Daikin Aurora class). Interior head high on the seating-zone wall, opposite the screen.
Backup: 1,500 W electric wall heater on its own thermostat, set to hold 10°C unoccupied. Sized to carry the building alone at design temperature if the heat pump is down.
Controls: smart thermostat with dehumidification mode and remote access, so the owner pre-heats the shed from the house. This is a selling feature, not a luxury, in January.
Exterior unit: wall bracket stand minimum 18" above grade, snow hood, drip tray with defrost condensate management, located clear of roof shed path and gas line.

Ventilation

ERV (Panasonic Intelli-Balance class, 30-60 CFM): supply high on the screen wall (the coldest surface, where condensation would form), exhaust at the seating zone ceiling. Continuous low speed with boost switch.
Runs on a dedicated circuit; ducts penetrate the envelope once, sealed with acoustical sealant and gasketed collars.

Electrical load summary (for the 30-amp generator-ready claim)

Load	Watts
Heat pump, heating at design	3,500
Backup heater	1,500
ERV	100
AV: projector, TV, computer, audio, fridge	1,200
Lighting and receptacles	600
Design total (with diversity)	~5,400 W / 240V

Conclusion: a 30-amp 240V feed (7,200 W) carries the building with margin, validating the generator-ready marketing claim, but only with the load calc on record. Add a whole-panel surge protector; launch monitors and projectors do not forgive prairie grid events.

Section 5 · Drawing Revision Plan

Sheet by sheet, what changes

Sheet	Revise to
A0.0 Cover	Add Gen 2 issue date, engineer-of-record block, and the assembly schedule reference note
A1.1 (new)	Master Assembly Schedule (Section 3) plus wall, roof and floor section details at 3/4" scale
A2.1 Foundation / Floor	Delete all R-value callouts (reference A1.1); add insulated skirt detail and rodent mesh; confirm pile layout unchanged
A2.2 Roof Plan	2:12 slope, 1'-6" low-eave overhang, snow guard layout, heated eave cable rough-in, gutter and downspout locations, heat pump stand clear of shed path
A2.3 Fixture Plan	Shift hitting zone to high side; ERV and supply grille at screen wall; surface fixtures over swing arc; remove recessed pots from swing zone; add surge protector note
A3.1 / A3.2 Elevations	Updated roof geometry and heights; heat pump stand at 18" with snow hood; door spec to insulated core with thermal threshold
A4.1 Sections / Interior	New 2:12 section; screen wall assembly A3 with rigid insulation; ceiling penetration schedule per A7
M1.1 (new)	Mechanical plan: heat pump, backup heater, ERV duct routing, condensate, controls; heating load calc summary
E1.1 Power	Add ERV circuit, backup heater circuit, surge protector, revised panel schedule with load calc reference
E1.2 Lighting	Surface linear fixtures over swing zone; IC airtight housings elsewhere; switching zones for play mode versus entertaining mode

Before permit: Manitoba-licensed engineer stamps structure (piles, beams, trusses, 2:12 roof) and the mechanical design is coordinated. The set remains PRELIMINARY until both stamps are on.

Section 6 · Productized Upgrade Packages

Three packages, one story

Package 1

Prairie-Proof Roof

2:12 standing seam, full ice and water, snow guards, heated eave rough-in, oversized gutter. Turns the biggest warranty risk into a headline feature. Estimated cost: $2,000-$3,500.

Package 2

Four-Season Comfort

Cold-climate heat pump, ERV, smart stat with dehumidify and remote pre-heat, sized backup heat. This is the package that makes "4-season" literally true. Estimated cost: $4,500-$7,000.

Package 3

Pro AV Protection

Surface fixtures over the swing arc, short-throw projector behind the hitting zone or caged mount, filtered vented computer cabinet, whole-panel surge protection. Estimated cost: $1,200-$2,500.

Option

Quiet Neighbour Acoustics

Full-height padded panels, acoustical sealant at all penetrations, insulated door. The upgrade that keeps the customer's spouse happy and the neighbours friendly. Estimated cost: $1,500-$3,000.

Packages 1 and 2 should become standard on every Lux Shed, not options: they are what the marketing already promises. Package 3 and the acoustic option are genuine upsells, and they slot directly into the Project Coordinator agent's upsell attach KPI from the revenue model.

Section 6A · Materials Appendix: Acoustics

Sealant and panel specifications

Acoustic sealant

Product	Role	Approx. cost	Spec status
Tremco Acoustical Sealant / Tremproof 250	Non-hardening butyl caulk; seals poly, outlets, panel edges, every envelope penetration	$12-15 / tube	Base spec, every build
OSI SC175 Acoustic Sealant	Budget equivalent; marginally less flexible, fine for this application	$7-8 / tube	Approved alternate
Green Glue Noiseproofing Compound	Damping layer between two rigid layers; the product that actually stops transmission	~$20 / tube, 2 tubes per 4x8 sheet	Premium option, screen wall and neighbour-facing wall only

Spec rule: acoustic sealant is a caulking product and belongs in the base build at every penetration (pennies per unit). Green Glue is a constrained-layer damping compound and is a genuine cost add; reserve it for the Quiet Neighbour premium build. Do not substitute one for the other; they do different jobs.

Sound panels

Panels must do two jobs in a simulator room: absorb echo (NRC 0.85 or better at 2" thickness) and survive ball strikes. Decorative foam and felt panels fail the second test and are excluded from this spec.

Option	Construction	Performance	Approx. cost / sq ft
Commercial impact-rated panels	Fabric-wrapped, 1"-2" mineral wool or fiberglass core, rigid ply backing (Acoustical Solutions / Residential Sound Panels golf-simulator lines)	NRC 0.85+, ball-strike rated	$15-30
Shop-built panels (recommended for Golf Haven)	2" Rockwool Safe'n'Sound over 1/2" ply backer, wrapped in acoustically transparent fabric, mounted with air gap	NRC ~0.95 at 2" with air gap, ball-strike resistant	$4-8

Recommendation: shop-built panels. Rockwool Safe'n'Sound is Canadian, widely stocked, and the shop-built assembly matches the board-and-batten interior aesthetic at roughly a third of commercial panel cost. It also keeps the margin in-house instead of sending it to a US panel supplier.

Placement priority

Side walls flanking the hitting zone: full height, 2" panels. This is where mis-hits go and where transmission complaints start.
Wall behind the player: 2" panels, mid-height band. Catches bounce-back and speaker energy.
Ceiling over the swing arc: 2" panels between surface fixtures. Kills the slap echo off the gypsum.
Screen wall: no acoustic panels required. The impact screen and padded backing already absorb; spend the budget on Green Glue in the wall assembly instead.

Honest performance framing (for the sales conversation)

Panels and sealant dampen echo and take the edge off transmission; they do not soundproof. True soundproofing is mass plus damping plus decoupling: double-layer walls with Green Glue, insulated door, sealed penetrations. The Quiet Neighbour package as specced gets complaint risk down enough for most backyard installs. The Green Glue premium option is for the customer with a bedroom window fifteen feet from the shed. Say this plainly; it builds more trust than overpromising, and it sets up the premium upgrade honestly.

Section 7 · Build Sequence and QA

Order of operations

Engineering (weeks 1-3). Issue this design basis to the engineer of record; stamp structure and mechanical; confirm standing seam profile warranty at 2:12 in writing from the roofing manufacturer.
Long-lead orders (weeks 2-4). Trusses, standing seam, heat pump, ERV, door. Cold-climate heat pumps and ERVs are the two items most likely to delay a spring build.
Substructure (week 5). Piles, beams, floor frame; install rigid under-floor insulation and rodent mesh before the deck closes; skirt after frame.
Envelope (weeks 6-7). Walls, trusses, roof. Poly and acoustical sealant stage inspection before any board or battens go on; blower-door-style smoke test at penetrations.
Mechanical rough-in (week 8). Heat pump lines, ERV ducts, backup heater, electrical. Photograph every concealed penetration before closing.
Interior and AV (weeks 9-10). Screen wall assembly A3, padded panels, oak slats, fixtures, projector, launch monitor, commissioning.
Commissioning and QA (week 11). Heat pump performance test at low ambient, ERV airflow balance, thermostat schedules, swing-clearance check with a real driver, ball-strike test on fixtures near the arc, handover walkthrough with the owner.

QA gates

Envelope sealed and photographed before interior finishes (no exceptions; this is the warranty line)
Manufacturer warranty letter for the roof profile on file per project
Load calc and panel schedule in the project binder handed to the customer
Commissioning record: heat pump output, ERV flows, thermostat schedule, surge protector test

Each QA gate is a photo and a checklist item, which means it is also exactly the kind of milestone evidence the Project Coordinator agent can push to the buyer automatically during the build. The engineering discipline and the AI story reinforce each other.

The Prairie-Proof ShedBuild plan and drawing revision guide