88 GREENHOUSES 



It will also be necessary to make a frame 

 for the door at one end, and to reinforce the 

 gable glazing bars with 2 x 4-inch scantling. 

 The house is then ready for glazing, instruc- 

 tions for which will be found in Chapter VII. 



If cypress or cedar lumber is used through- 

 out, and if kept carefully painted, a house 

 like the above should last for fifteen or 

 twenty years. The most vulnerable parts are 

 the posts, especially the portion where they 

 enter the cement. They should be painted 

 regularly once each year at this point. While 

 these houses do not admit as much light as 

 either a semi-iron or an all-iron frame they 

 will give excellent service. A poorly built 

 all-wood frame house is a constant expense 

 for maintenance. 



Semi-iron Frame Houses. Two methods 

 of framing a semi-iron frame house are 

 shown in Fig. 33. The method shown on the 

 left requires twice as many purlin posts as 

 the one on the right. In each case gaspipe 

 is used. The work of erecting differs but 

 little from that described for wood frame 

 houses, except that pipe working tools are 

 required, and a little more skill is necessary. 

 An endless variety of fittings may be had 



