# RedX Apps

> Free 3D construction calculators and framing guides for decks, roofs, stairs, and walls.
> Every calculator draws the framing plan, computes cut angles, and exports cut lists and
> permit-ready blueprints. Free on web, iOS, and Android. Guides cite the 2021 International
> Residential Code (IRC) with section numbers; calculations match the tools' implementations.

## Deck building 

- [3D Deck Builder](https://www.redxapps.com/build/deck-builder): draw any deck shape; auto-framing to span limits, cut lists, permit-ready blueprints
- [Deck Framing - Complete Guide](https://www.redxapps.com/guides/deck-framing): anatomy, sequence, joist/beam sizing per IRC R507
- [Ground Level Deck Guide](https://www.redxapps.com/guides/ground-level-deck): floating decks, footing options, ground-contact lumber
- [Deck Footings](https://www.redxapps.com/guides/deck-footings): types, frost depth, sizing math per IRC R507.3
- [Deck Ledger Board](https://www.redxapps.com/guides/deck-ledger-board): attachment per IRC R507.9, flashing, what never to attach to
- [How to Build Deck Stairs](https://www.redxapps.com/guides/how-to-build-deck-stairs): stringer math, attachment, landings
- [Deck Stair Code](https://www.redxapps.com/guides/deck-stairs-code): IRC 2021 rise/run/guard/handrail limits with citations
- [Deck Joist Span Chart](https://www.redxapps.com/span-tables/deck-joist-span-chart): joist span tables by size and spacing

## Roof framing

- [Roof Builder](https://www.redxapps.com/build/roof-builder): auto-generates rafters, hips, valleys with blueprints
- [Rafter Calculator](https://www.redxapps.com/build/common-rafter-calculator): rafter lengths and cut angles
- [How to Calculate Rafter Length](https://www.redxapps.com/guides/how-to-calculate-rafter-length): formulas with pitch multiplier table
- [Roof Pitch Chart](https://www.redxapps.com/guides/roof-pitch): every pitch 1/12-24/12 in degrees with slope factors
- [Roof Pitch to Degrees](https://www.redxapps.com/guides/roof-pitch-to-degrees): conversion method and chart

## Stairs

- [Stair Builder](https://www.redxapps.com/build/stair-builder): any staircase with stringer blueprints and cut lists
- [How to Calculate Stair Stringers](https://www.redxapps.com/guides/how-to-calculate-stair-stringers): riser math with worked examples
- [Stair Rise and Run Code](https://www.redxapps.com/guides/stair-rise-and-run-code): IRC vs IBC limits
- [Spiral Staircase Dimensions](https://www.redxapps.com/guides/spiral-staircase-dimensions): code minimums and diameter tables

## Walls

- [Wall Builder](https://www.redxapps.com/build/wall-builder): stud layouts with cut lists and blueprints
- [How to Frame a Wall](https://www.redxapps.com/how-to-frame-a-wall): step-by-step framing guide

## Reference

- [All Guides](https://www.redxapps.com/guides)
- [Span Tables](https://www.redxapps.com/span-tables)
- [Editorial Policy](https://www.redxapps.com/editorial-policy): how numbers are computed and verified