Open engineeringSOURCE GEOMETRY CALCULATION ASSUMPTION Source library
Methodology
Šapice does not turn an estimate into a certificate. Every model separates sourced information, geometry-derived values, calculations and remaining assumptions.
A value or rule comes from an external source recorded in the provenance library.
A value is derived directly from canonical model geometry without manual duplication.
A value is produced by a deterministic calculation over known inputs.
A design assumption is explicitly labeled and is not presented as confirmed fact.
Thermal calculation
The current engine estimates steady-state transmission through walls, floor and roof. Method v1.2.0 uses ISO 6946 orientation-specific surface resistances: Rsi 0.13 m²K/W for walls, 0.10 for upward heat flow through the roof and 0.17 for downward heat flow through the floor, with Rse 0.04 m²K/W. The model does not yet claim validated entrance infiltration, animal metabolic heat, wind effects, 2D framing thermal bridges or full hygrothermal behavior. The result is therefore not a temperature guarantee.
Ventilation
V1 does not claim a universal required ventilation-opening area. The compiler reserves high-rear PROVISION zones that avoid provisional framing, while the actual cutout and net free area depend on the selected adjustable vent insert. Field validation must include condensation, moisture and localized drafts. The thermal engine does not calculate airflow through those future openings.
Heating
The application does not design improvised electrical heaters. Heated models define space and constraints for a compatible purpose-built pet-heating product; its declarations and manufacturer instructions remain authoritative for installation.
Validation status
- DATA_VALIDATED
- GEOMETRY_VALIDATED
- ENGINEERING_REVIEWED
- PROTOTYPE_BUILT
- FIELD_TESTED
Status advances only when the preceding level has actually been completed. Software tests are never presented as physical shelter testing.
Current technical sources
ASPCApro · Tier 1Winter Shelters for Community Cats: FAQs and Cold Weather TipsSupports small insulated shelters, cat-sized entrances, elevation from wet ground, straw bedding and predator-aware entrance decisions.UK Government · Tier 1Dog kennel boarding licensing: statutory guidance for local authoritiesRequires adequate ventilation without excessive localised draughts and to avoid excess humidity. Šapice uses this only as a qualitative ventilation principle; it is commercial-kennel guidance, not a dimensional standard for these small auxiliary shelters.Humane World for Animals · Tier 1How to Keep Pets Warm in Cold WeatherEmphasizes indoor shelter when possible; when a dog must be outside, shelter should be dry, draft-free, raised and appropriately sized.ASPCA · Tier 1Cold Weather Safety TipsSupports the limitation that outdoor auxiliary shelters are not a substitute for keeping companion animals indoors during severe cold.APA - The Engineered Wood Association · Tier 1Builder Tips: Proper Installation of APA Rated Sheathing for Roof Applications (N335)Reference starting point for panel fastening geometry: approximately 6 in edge spacing, 12 in intermediate spacing and about 3/8 in edge offset. Šapice does not treat this roof-sheathing guide as a certified fastening design for pet shelters.Owens Corning Roofing · Tier 1Oakridge and TruDefinition Duration Oakridge Shingles Installation InstructionsManufacturer example showing that low-slope roof assemblies require slope-specific underlayment/edge details. Šapice uses this as evidence that final roof covering compatibility must follow the selected product instructions, not as a universal shelter roofing specification.FIBRAN · Tier 1FIBRANxps 300 Technical Data SheetDeclares 1250 × 600 mm board dimensions and λD 0.033 W/mK for thicknesses up to 60 mm.USDA Forest Products Laboratory · Tier 1Wood Handbook: Wood as an Engineering Material, Chapter 4Documents that wood thermal conductivity varies materially with species, density, moisture content and grain direction.Nord Compensati · Tier 2Technical Specifications of Birch Marine PlywoodManufacturer technical specification lists thermal conductivity of 0.17 W/mK for birch marine plywood.ISO · Tier 1ISO 10456:2007 - Hygrothermal properties - Declared and design thermal valuesCurrent published edition, confirmed in 2023; provides procedures for declared/design thermal values and conversion for temperature and moisture conditions.ISO · Tier 1ISO 6946:2017 - Thermal resistance and thermal transmittance - Calculation methodsMethodological reference for steady-state layer resistance and transmittance. Thermal method v1.1 applies orientation-specific internal surface resistances: Rsi 0.10 m²K/W for upward heat flow, 0.13 for horizontal and 0.17 for downward, with Rse 0.04 m²K/W. The app does not claim ISO certification.ISO · Tier 1ISO 13789:2017 - Transmission and ventilation heat transfer coefficientsMethodological reference for separating transmission and ventilation heat transfer. The MVP does not claim a validated infiltration model.ISO · Tier 1ISO 13788:2012 - Surface humidity and interstitial condensation calculation methodsDocuments limitations of simplified moisture indicators; full hygrothermal simulation is outside the MVP.IEC · Tier 1IEC 60335-2-71:2018 - Particular requirements for electrical heating appliances for breeding and rearing animalsSafety reference for electrical animal-heating appliances. The app only accommodates purpose-built products and does not claim product certification.Alley Cat Allies · Tier 1Providing ShelterDescribes a community-cat shelter of about 2 ft × 3 ft and at least 18 in high for three to five cats, a doorway about 6-8 in wide, an entrance away from prevailing wind or a flap/L-shaped entry, straw rather than hay or blankets, pallets for elevation and scrap lumber from building supply stores or contractors.Alley Cat Allies · Tier 1How to Build an Outdoor ShelterStep-by-step tote-in-tote shelter: an approximately 30 gallon outer tub, an approximately 20 gallon inner tub, a thin foam slab under the inner tub, straw (not hay) and one tube entrance through both tubs. No elevation height is specified.Alley Cat Allies · Tier 1Straw, not Hay, for Outdoor Cat SheltersStraw repels moisture while hay soaks it up and can mold. Loosely pack straw to the quarter or halfway point; store spare straw dry and off the ground.Alley Cat Allies · Tier 1Outdoor Cat Cold Weather TipsRecommends straw instead of blankets or hay, elevation, clearing snow from entrances and exits, and keeping antifreeze and de-icers away from cats.Alley Cat Allies · Tier 1Summer Weather TipsShelters in summer should be shaded, placed on grass or dirt rather than concrete and have two openings so hot air can cycle through; water belongs in shade and should be refreshed often.Humane World for Animals · Tier 1Heatwave alert: protect pets amid soaring temperaturesStates that doghouses do not provide relief from heat and can make it worse; trees and tarps are ideal shade because they do not obstruct airflow; old, young, overweight and short-muzzled animals are at higher risk.USDA APHIS Animal Care · Tier 1Temperature Requirements for Dogs (Animal Care Tech Note, APHIS-22-031)Regulatory guidance for US Animal Welfare Act licensees and registrants, not for private companion dogs. Requires shelter with a wind break and rain break at the entrance, dry bedding in cold, shade outside the shelter because shelters may become too warm, continuous water access, and excludes unacclimated, elderly, sick or very young dogs from outdoor housing. Šapice does not transfer its temperature thresholds into universal safe temperatures.U.S. DOE Building America Solution Center (PNNL) · Tier 1Typical R-Values and Vapor Retarder Classifications of Common Insulation MaterialsTypical R-value per inch: EPS 3.8-4.4, XPS 5, polyiso approx. 6, fiberglass batt or board 2.5-4, mineral wool board 3-4. Šapice converts these to planning λ ranges (λ = 0.0254 m / (R_IP × 0.1761)); a product datasheet always takes precedence.International Plant Protection Convention (IPPC) · Tier 1ISPM 15: Regulation of wood packaging material in international tradePhytosanitary standard for wood packaging in international trade, including treatment codes such as HT (heat treatment) and MB (methyl bromide). The mark confirms a phytosanitary treatment only; it says nothing about the later history, contamination or condition of a used pallet.U.S. Environmental Protection Agency · Tier 1Chromated Arsenicals (CCA)CCA-treated wood was withdrawn from US homeowner uses at the end of 2003, but older structures may still contain it. Do not burn it; use dust protection when sawing and wash hands after handling. Šapice therefore rejects unknown old treated timber wherever an animal could chew or lick it.