CHAPTER XIII.
THE ROOF.
§ I. Hitherto our enquiry has been unembarrassed by any considerations relating exclusively either to the exterior or interior of buildings. But it can remain so no longer. As far as the architect is concerned, one side of a wall is generally the same as another; but in the roof there are usually two distinct divisions of the structure; one, a shell, vault, or flat ceiling, internally visible, the other, an upper structure, built of timber, to protect the lower; or of some different form, to support it. Sometimes, indeed, the internally visible structure is the real roof, and sometimes there are more than two divisions, as in St. Paul’s, where we have a central shell with a mask below and above. Still it will be convenient to remember the distinction between the part of the roof which is usually visible from within, and whose only business is to stand strongly, and not fall in, which I shall call the Roof Proper; and, secondly, the upper roof, which, being often partly supported by the lower, is not so much concerned with its own stability as with the weather, and is appointed to throw off snow, and get rid of rain, as fast as possible, which I shall call the Roof Mask.
§ II. It is, however, needless for me to engage the reader in the discussion of the various methods of construction of Roofs Proper, for this simple reason, that no person without long experience can tell whether a roof be wisely constructed or not; nor tell at all, even with help of any amount of experience, without examination of the several parts and bearings of it, very different from any observation possible to the general critic: and more than this, the enquiry would be useless to us in our Venetian studies, where the roofs are either not contemporary with the buildings, or flat, or else vaults of the simplest possible constructions, which have been admirably explained by Willis in his “Architecture of the Middle Ages,” Chap. VII., to which I may refer the reader for all that it would be well for him to know respecting the connexion of the different parts of the vault with the shafts. He would also do well to read the passages on Tudor vaulting, pp. 185-193, in Mr. Garbett’s rudimentary Treatise on Design, before alluded to.[50] I shall content myself therefore with noting one or two points on which neither writer has had occasion to touch, respecting the Roof Mask.
§ III. It was said in § V. of Chapter III. that we should not have occasion, in speaking of roof construction, to add materially to the forms then suggested. The forms which we have to add are only those resulting from the other curves of the arch developed in the last chapter; that is to say, the various eastern domes and cupolas arising out of the revolution of the horseshoe and ogee curves, together with the well-known Chinese concave roof. All these forms are of course purely decorative, the bulging outline, or concave surface, being of no more use, or rather of less, in throwing off snow or rain, than the ordinary spire and gable; and it is rather curious, therefore, that all of them, on a small scale, should have obtained so extensive use in Germany and Switzerland, their native climate being that of the east, where their purpose seems rather to concentrate light upon their orbed surfaces. I much doubt their applicability, on a large scale, to architecture of any admirable dignity; their chief charm is, to the European eye, that of strangeness; and it seems to me possible that in the east the bulging form may be also delightful, from the idea of its enclosing a volume of cool air. I enjoy them in St. Mark’s, chiefly because they increase the fantastic and unreal character of St. Mark’s Place; and because they appear to sympathise with an expression, common, I think, to all the buildings of that group, of a natural buoyancy, as if they floated in the air or on the surface of the sea. But, assuredly, they are not features to be recommended for imitation.[51]
| Fig. XXXVII. |
§ IV. One form, closely connected with the Chinese concave, is, however, often constructively right,—the gable with an inward angle, occurring with exquisitely picturesque effect throughout the domestic architecture of the north, especially Germany and Switzerland; the lower slope being either an attached external penthouse roof, for protection of the wall, as in [Fig. XXXVII.], or else a kind of buttress set on the angle of the tower; and in either case the roof itself being a simple gable, continuous beneath it.
§ V. The true gable, as it is the simplest and most natural, so I esteem it the grandest of roofs; whether rising in ridgy darkness, like a grey slope of slaty mountains, over the precipitous walls of the northern cathedrals, or stretched in burning breadth above the white and square-set groups of the southern architecture. But this difference between its slope in the northern and southern structure is a matter of far greater importance than is commonly supposed, and it is this to which I would especially direct the reader’s attention.
§ VI. One main cause of it, the necessity of throwing off snow in the north, has been a thousand times alluded to: another I do not remember having seen noticed, namely, that rooms in a roof are comfortably habitable in the north, which are painful sotto piombi in Italy; and that there is in wet climates a natural tendency in all men to live as high as possible, out of the damp and mist. These two causes, together with accessible quantities of good timber, have induced in the north a general steep pitch of gable, which, when rounded or squared above a tower, becomes a spire or turret; and this feature, worked out with elaborate decoration, is the key-note of the whole system of aspiration, so called, which the German critics have so ingeniously and falsely ascribed to a devotional sentiment pervading the Northern Gothic: I entirely and boldly deny the whole theory; our cathedrals were for the most part built by worldly people, who loved the world, and would have gladly staid in it for ever; whose best hope was the escaping hell, which they thought to do by building cathedrals, but who had very vague conceptions of Heaven in general, and very feeble desires respecting their entrance therein; and the form of the spired cathedral has no more intentional reference to Heaven, as distinguished from the flattened slope of the Greek pediment, than the steep gable of a Norman house has, as distinguished from the flat roof of a Syrian one. We may now, with ingenious pleasure, trace such symbolic characters in the form; we may now use it with such definite meaning; but we only prevent ourselves from all right understanding of history, by attributing much influence to these poetical symbolisms in the formation of a national style. The human race are, for the most part, not to be moved by such silken cords; and the chances of damp in the cellar, or of loose tiles in the roof, have, unhappily, much more to do with the fashions of a man’s house building than his ideas of celestial happiness or angelic virtue. Associations of affection have far higher power, and forms which can be no otherwise accounted for may often be explained by reference to the natural features of the country, or to anything which habit must have rendered familiar, and therefore delightful; but the direct symbolisation of a sentiment is a weak motive with all men, and far more so in the practical minds of the north than among the early Christians, who were assuredly quite as heavenly-minded, when they built basilicas, or cut conchas out of the catacombs, as were ever the Norman barons or monks.