Albuquerque’s ground snow load comes in at a modest 5 psf, a number that trips up people who picture New Mexico as a place with dramatic mountain blizzards on every roof. That figure sets the load on the ground, not on the shingles, and the gap between the two matters more than the number itself. Pull the actual design values your local building department uses before you order a truss package or plan a re-roof, rather than assuming a number from a snowier state applies here.
What is the ground snow load in New Mexico?
The design ground snow load at Albuquerque is 5 psf, mapped under ASCE 7-16, the edition that IRC/IBC 2021 makes applicable in most states. That is the number a permit application, a plan reviewer and the engineer stamping your truss drawings start from. It is not, however, the load your rafters actually see: the code applies exposure, thermal and slope factors to convert the ground figure into a roof figure, and for an ordinary heated sloped house roof that conversion lands around 4 psf. A steeper roof sheds more and carries less; a flatter one carries closer to the full converted value.
ASCE 7-22, the edition a handful of jurisdictions are beginning to look at, maps the same Albuquerque point at 16 psf. That is not three times the snow. The 7-22 figure is a strength-level value used with a 1.0 load factor, while the 7-16 figure is nominal and used with a 1.6 factor: different bases, same physical hazard. Nobody’s roof got weaker overnight because a newer map exists, and the 7-16 number stays the one your permit uses until your jurisdiction actually adopts the later edition.
Every one of these figures is tied to Albuquerque specifically. Elevation drives snow load more than almost anything else in this state, and a county seat at 7,000 feet sees a different ground snow load than the Rio Grande valley does. If you are working from a set of truss drawings or a permit checklist, the number that governs is whatever your county’s building department has on file, not the Albuquerque figure repeated here. Treat this page as the reference point, not the final answer, and confirm the local value before it goes on a drawing.
How much snow can a roof hold in New Mexico?
There is no single number for this, and any page that gives you one in inches is guessing. What you can work from is the ground figure and the physics of what accumulated snow actually weighs.
From ground load to roof load, and where it concentrates
Starting from Albuquerque’s 5 psf ground value, an ordinary heated sloped roof lands near 0.7 of that, or roughly 4 psf, and a steep roof carries less still. The number that actually causes trouble is never the flat average across the whole roof plane. Snow drifts against a parapet or a taller adjoining wall, piles below a dormer, and stacks up in a valley where two roof planes meet. A lower roof next to a taller section of the same house can carry several times its own open-field share, because wind loads it from the roof above. That drifted load, not the mapped ground figure, is what most roof failures trace back to.
The other variable is what the snow itself has become. Fresh, light snow runs roughly 5 to 7 pounds per square foot per foot of depth. Settled or wet snow runs two to three times that. An ice layer, formed when a thaw refreezes, adds weight far out of proportion to its thickness. That is why a foot of March snow, wet and heavy after a warm afternoon, is a different load entirely from a foot of dry January powder, even though both measure the same on a yardstick.
Watch for the physical signs a roof is being asked to carry more than it should:
- Interior doors that suddenly stick or won’t latch
- New cracks in ceiling drywall, especially near the ridge
- A ridge line that looks visibly lower or wavier than it used to
- Popping or cracking sounds from the attic during or after a heavy snow
If you see any of those, the safe response is raking snow from the ground with a roof rake, working from the eaves, not climbing onto a loaded roof to shovel it. A roof already under stress is the worst possible place to add a person’s weight and the leverage of a shovel. For anything beyond routine raking, or if you’re unsure whether what you’re seeing is normal settling or a real problem, that’s a question for your building department or a licensed structural engineer, not a guess from a blog post.
What wind speed must a roof withstand in New Mexico?
The basic design wind speed at Albuquerque is 104 mph under ASCE 7-16, for Risk Category II buildings, which covers ordinary houses. That number is a 3-second gust measured at 33 feet in open (Exposure C) terrain, not a sustained wind speed and not the kind of number a weather forecast reports. If you compare it directly to a hurricane’s headline sustained speed, the code will look strangely low. It isn’t. It’s measuring a different, shorter, gustier thing, and the design procedures built around it account for that.
ASCE 7-22 maps the same Albuquerque point at the same 104 mph, so this is one of the few figures on this page where the newer edition doesn’t move the number at all.
What this figure actually buys the reader is the set of requirements behind it: the wind rating a shingle product must carry, the nailing pattern the installer follows, how the sheathing is fastened to the framing, and the strength of the connections tying the roof structure down to the walls. Edges, rakes and ridges fail first in high wind, because that’s where uplift pressure concentrates, which is why code detailing at those locations is stricter than in the field of a roof plane.
As with the snow figure, this number is Albuquerque’s, not the state’s. Wind exposure changes with terrain, and a site on open, unsheltered high ground can see different pressures than a sheltered valley location even at a similar basic wind speed. Your county’s building department will have the figure that applies to your specific site and Risk Category, and that’s the number that belongs on a permit application, not this one.
Does New Mexico require an ice barrier under the shingles?
An ice barrier is a self-adhering waterproof membrane installed along the eaves, running up the roof deck far enough to clear the interior wall line below. Its job isn’t to stop snow from accumulating. It’s to stop water from getting under the shingles when an ice dam forms and meltwater backs up against it.
What actually causes the dam
Ice dams form when heat escaping from the living space into the attic warms the roof deck enough to melt the snow sitting on it. That meltwater runs down the roof plane until it reaches the unheated overhang past the exterior wall, where it refreezes. The ice builds into a dam, and water pooling behind it finds its way under the shingles and into the deck. The membrane protects the deck from that water. It does nothing to stop the dam from forming in the first place. Only air sealing the attic floor and getting adequate insulation there actually prevents the cycle. A reader who installs the membrane and stops there has addressed the symptom, not the cause.
Whether ice dams are a real risk on a given roof in New Mexico depends heavily on local conditions. NOAA’s 1991-2020 climate normals put Albuquerque’s mean daily minimum in the coldest month at 26.4°F, cold enough for repeated freeze-thaw cycling through the winter, which is exactly the pattern that builds ice dams where snow sits on a poorly insulated roof. Combined with Albuquerque’s relatively modest 5 psf ground snow load, sustained deep snowpack isn’t the state’s defining feature the way it is in a heavier-snow climate, but a single freeze-thaw event on a poorly insulated attic can still form a damaging dam at the eave.
The code enforced statewide is the 2021 New Mexico Residential Building Code, based on the 2021 International Residential Code, administered by the Construction Industries Division of the New Mexico Regulation and Licensing Department, in force since July 14, 2023, as a statewide minimum that a municipality may exceed. The amendments New Mexico made to that model code, on record, address basement window egress framing and drop the radon appendix, not ice barrier provisions specifically. Whether your specific jurisdiction requires the membrane, and where, is a question for that permit office, since the statewide rule sets a floor and a local authority may add to it.
What roofing material suits New Mexico best?
The honest answer starts from the same three figures used above, not from a brand preference. Albuquerque’s design values, a 5 psf ground snow load and a 104 mph basic wind speed, sit alongside a climate that spans three IECC zones across the state’s 33 counties: zone 4B in 13 counties, zone 5B in 12, and zone 3B in 8. That spread means insulation targets differ by county even where the structural loads don’t, and it’s a reason to confirm your own county’s zone rather than assume the Albuquerque figures cover the whole state.
| Material | Snow behavior | Added dead weight | Wind consideration |
|---|---|---|---|
| Architectural asphalt shingles | Holds snow in place rather than shedding it | Low | Wind rating and nailing pattern both matter, a high-rated shingle installed to a lower nailing standard performs to that lower standard |
| Standing-seam metal | Sheds snow readily, sometimes suddenly | Low | Panel attachment and clip spacing carry the uplift load |
| Slate or concrete tile | Sheds less predictably than metal | High, adds directly to the structural snow load the framing already carries | Individual unit attachment is the governing detail |
Standing-seam metal’s tendency to shed snow well is an advantage on the roof and a liability at the ground: a slab of snow sliding off a metal roof can land on a doorway, a walkway or a parked car below, and where that slide lands is a design decision, made with snow guards or roof geometry, not something to leave to chance. Slate and concrete tile add real dead weight on top of whatever snow load the roof is already carrying, so that added weight has to be accounted for in the structural design from the start, not bolted on as an afterthought.
Past a certain wind speed, the fastening and the underlayment matter more than the material itself. A premium shingle nailed with too few fasteners or the wrong pattern performs like a cheap one in a gust. That’s a detail worth confirming with whoever is doing the installation, not something a product label settles on its own. General guidance on choosing and maintaining a roofing system covers the underlying steps this page assumes, like flashing details and deck preparation, that apply regardless of which material you land on.
None of these figures are unique to snow country. Coastal states work from a completely different governing hazard: the North Carolina coast’s roof snow load, wind speed and ice barrier rules are driven by hurricane wind and wind-borne debris requirements rather than snow depth, while a state like Alaska’s snow load and wind rules run at ground snow loads many times higher than Albuquerque’s. New Mexico’s roofing decisions sit in their own spot on that spectrum: modest ground snow load, ordinary wind speed for most of the state, and a climate cold enough at night to make attic insulation and air sealing the more useful investment over the ice barrier membrane alone.