78 GREENHOUSES 



FRAMING 



The woodwork of a greenhouse always be- 

 gins to decay at the joints. For this reason 

 particular attention is paid to the framing. 

 All joints are made to fit closely, and before 

 putting together each piece should be primed 

 with a thin coat of lead paint. The joints 



Fig. 47. The concentric system of construction 



are then given a heavy coating of thick white 

 lead and put together while the paint is still 

 green. 



In buying greenhouse material it is al- 

 ways well to buy all the woodwork from one 

 firm and to give the concern a careful de- 

 scription of -the house, together with a draw- 

 ing showing the width, height and length of 

 the house, the pitch of the roof, size of glass 

 to be used, etc. The firm will then send the 



