# 🚀 New Feature: MWFRS Directional Procedure (ASCE 7-22)

**URL:** <https://blueprint.calcs.com/t/new-feature-mwfrs-directional-procedure-asce-7-22/702>\
**Category:** Announcements\
**Created:** [March 16, 2026, 4:44pm UTC](https://blueprint.calcs.com/t/new-feature-mwfrs-directional-procedure-asce-7-22/702 "2026-03-16T16:44:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![David](https://yyz1.discourse-cdn.com/flex029/user_avatar/blueprint.calcs.com/david/32/156_2.png) [@David](https://blueprint.calcs.com/u/David)\
**Post date:** [March 16, 2026, 4:44pm UTC](https://blueprint.calcs.com/t/new-feature-mwfrs-directional-procedure-asce-7-22/702/1 "2026-03-16T16:44:17Z")

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We’ve added support for the **Main Wind Force Resisting System (MWFRS) Directional Procedure** to the **ASCE 7-22 and ASCE 7-16 wind loads calculators**.

This feature calculates **direction-specific wind pressures** on walls and roofs in accordance with **ASCE 7 Chapter 27** , helping engineers evaluate building response based on wind orientation.

### Key capabilities

• **Directional wind analysis** — Choose **N-S (normal to ridge)** or **E-W (parallel to ridge)** wind direction.  
• **Automatic geometry mapping** — Building dimensions are converted to **L and B** based on wind direction.  
• **ASCE-based Cp values** — External pressure coefficients are applied using **Fig. 27.3-1** , including interpolation for **L/B** , **h/L** , and roof slope.  
• **Accurate velocity pressures** — Calculates **q\_z** and **q\_h** using exposure and topographic factors.  
• **Surface-specific design pressures** — Generates **positive and negative internal pressure cases** for each surface.  
• **Windward wall pressure variation** — Uses **height-dependent velocity pressure (q\_z)**.  
• **Minimum pressure checks** — Applies **ASCE 7-22 minimum pressures** where required.

### How it works

1️⃣ Select **MWFRS (Directional Procedure)** in the wind template.  
2️⃣ Choose the **wind direction (N-S or E-W)**.  
3️⃣ The calculator determines **directional building ratios (L/B, h/L)** and **roof angle conditions**.  
4️⃣ **Cp values** are taken from **ASCE Fig. 27.3-1**.  
5️⃣ The tool computes **design wind pressures for walls and roof surfaces**.

This provides a clearer way to evaluate **direction-dependent wind loading** for MWFRS design directly inside the wind loads template.

📘 Based on **ASCE 7-22 Chapter 27** (Directional Procedure).  
⚠ The optional Cp reduction noted in **Fig. 27.3-1 (b)** is **not applied**.

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