From 26902520464c335f7169024473a18d7d4284ea26 Mon Sep 17 00:00:00 2001
From: Bruno Postle <bruno@postle.net>
Date: Sun, 1 Mar 2026 13:38:26 +0000
Subject: [PATCH] Add lean-to porch roof (Pattern 116/117): cascade and
 sheltering eave at entrance
MIME-Version: 1.0
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Shed roof over entrance porch: ridge at 3.5m (main wall plate), eave at
2.0m (approx 6ft7in) at east face. Creates visible roof cascade — main
hall pitched roof higher, entrance porch lower — per Patterns 116 and 117.
---
 _test_simple.ifc | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/_test_simple.ifc b/_test_simple.ifc
index 248fa6c..6e3b486 100644
--- a/_test_simple.ifc
+++ b/_test_simple.ifc
@@ -84,7 +84,7 @@ DATA;
 #97=IFCAXIS2PLACEMENT3D(#94,#95,#96);
 #98=IFCLOCALPLACEMENT(#82,#97);
 #99=IFCELEMENTASSEMBLY('1JMWfAC15Dh9jLMGikyiLb',$,'exterior',$,$,#110,$,$,$,$);
-#105=IFCRELCONTAINEDINSPATIALSTRUCTURE('3Pqhf1QtP2Ivceh_6HdxtU',$,$,$,(#4285,#5234,#5047,#3095,#5072,#4320,#2524,#5022,#2162,#1653,#99,#1305),#86);
+#105=IFCRELCONTAINEDINSPATIALSTRUCTURE('3Pqhf1QtP2Ivceh_6HdxtU',$,$,$,(#4285,#5234,#5047,#3095,#5072,#4320,#5456,#2524,#5022,#2162,#1653,#99,#1305),#86);
 #106=IFCCARTESIANPOINT((-3.44354057312012,3.,0.));
 #107=IFCDIRECTION((0.,0.,1.));
 #108=IFCDIRECTION((0.233915393914003,-0.972256955999831,0.));
@@ -4435,5 +4435,24 @@ DATA;
 #5453=IFCRELASSIGNSTOCONTROL('19YDdIYUn5CRqm5sDHv0R3',$,$,$,(#4972,#5234),$,#5452);
 #5454=IFCQUANTITYCOUNT('Unnamed',$,$,2.,$);
 #5455=IFCCOSTVALUE($,$,IFCMONETARYMEASURE(750.),$,$,$,$,$,$,$);
+#5456=IFCROOF('2G$thAfmjEcQdzuCHO6qTi',$,'porch roof',$,$,#5474,#5464,$,.SHED_ROOF.);
+#5457=IFCCARTESIANPOINTLIST2D(((0.,0.),(2.9,0.),(2.9,2.78951555086912),(0.,2.78951555086912)));
+#5458=IFCINDEXEDPOLYCURVE(#5457,$,$);
+#5459=IFCDIRECTION((0.,-0.538789878083122,0.842440186170612));
+#5460=IFCDIRECTION((-0.,0.538789878083122,-0.842440186170612));
+#5461=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#5458);
+#5462=IFCEXTRUDEDAREASOLID(#5461,$,#5460,0.142443347278423);
+#5463=IFCSHAPEREPRESENTATION(#11,'Body','SweptSolid',(#5462));
+#5464=IFCPRODUCTDEFINITIONSHAPE($,$,(#5463));
+#5470=IFCCARTESIANPOINT((2.25,1.35,3.5));
+#5471=IFCDIRECTION((0.,0.,1.));
+#5472=IFCDIRECTION((0.,-1.,0.));
+#5473=IFCAXIS2PLACEMENT3D(#5470,#5471,#5472);
+#5474=IFCLOCALPLACEMENT(#92,#5473);
+#5475=IFCPROPERTYSET('2pxVbH$NL4pxmVCld85_AD',$,'EPset_Pattern',$,(#5477,#5478,#5479));
+#5476=IFCRELDEFINESBYPROPERTIES('2$SP4gU8H8FRlV7aYbt4Ae',$,$,$,(#5456),#5475);
+#5477=IFCPROPERTYSINGLEVALUE('PatternNumber',$,IFCLABEL('116/117'),$);
+#5478=IFCPROPERTYSINGLEVALUE('PatternName',$,IFCLABEL('Cascade of Roofs / Sheltering Roof'),$);
+#5479=IFCPROPERTYSINGLEVALUE('Notes',$,IFCLABEL('Lean-to shed roof over entrance porch. Ridge at 3.5m (main building wall plate), eave at 2.0m (approx 6ft7in) at east face per Pattern 117. Creates cascade: main hall pitched roof higher, porch roof lower.'),$);
 ENDSEC;
 END-ISO-10303-21;