Moderate

ZIP Code 21042

Howard County, Maryland — Ellicott City

25PSF (Ground Snow Load)
ModerateClassification

What This Means

Howard County, Maryland has a moderate ground snow load of 25 PSF per ASCE 7-22. This load requires proper structural consideration during design. Roof framing, trusses, and connections should be engineered for this snow load. Ensure adequate drainage to prevent ponding.

Snow Load Details

ZIP Code21042
CountyHoward
CityEllicott City
StateMaryland (MD)
Ground Snow Load25 PSF — Moderate
Classification Range21 - 40 PSF
Data QualityMeasured

Source: ASCE 7-22 ground snow load polygons via ArcGIS

Roof Snow Load Calculator

ASCE 7-22 flat roof formula:  pf = 0.7 × Ce × Ct × Is × pg

Your ground snow load (pg): 25 PSF

Roof Snow Load: 17.5 PSF

ⓘ Simplified estimate for flat roofs. Sloped roofs, drift zones, and unbalanced loads need additional calculations. Consult a structural engineer for final design.

Howard County Snow Load Map

Counties colored by snow load classification. Gray = No Load, Blue = Light, Amber = Moderate, Orange = Heavy, Red = Extreme, Purple = Case Study.

New Lookup

Check Another ZIP Code

Nearby ZIP Codes

21040 25 PSF Moderate 21043 25 PSF Moderate 21044 25 PSF Moderate 21045 25 PSF Moderate

Frequently Asked Questions

What is the ground snow load for ZIP code 21042?

ZIP code 21042 is in Howard County, Maryland, with a ground snow load of 25 PSF, classified as moderate per ASCE 7-22.

Is my roof strong enough for snow in 21042?

With a moderate ground snow load of 25 PSF, standard residential construction typically handles this load, but verify with your local building code.

What county is ZIP code 21042 in?

ZIP code 21042 is in Howard County, Maryland (MD).